diff --git a/otp.c b/otp.c
index 3ed61d1..49e26c5 100644
--- a/otp.c
+++ b/otp.c
@@ -2300,7 +2300,7 @@ void simple_entropy_mix(unsigned char* urandom_buffer, size_t buffer_size,
     }
 }
 
-// Enhanced input function for filename with directory separation
+// Enhanced input function with editable pre-filled text
 int get_filename_with_default(const char* prompt, const char* default_path, char* result, size_t result_size) {
     // Find the last directory separator
     char* last_slash = strrchr(default_path, '/');
@@ -2324,33 +2324,168 @@ int get_filename_with_default(const char* prompt, const char* default_path, char
         filename[sizeof(filename) - 1] = '\0';
     }
     
-    // Display the enhanced prompt with directory and filename separated by colon
-    printf("\n%s\n%s: %s", prompt, directory, filename);
+    // Setup terminal for raw input
+    struct termios orig_termios;
+    if (tcgetattr(STDIN_FILENO, &orig_termios) != 0) {
+        // Fallback to simple input if terminal control fails
+        printf("\n%s\n%s: ", prompt, directory);
+        fflush(stdout);
+        
+        char input_buffer[512];
+        if (!fgets(input_buffer, sizeof(input_buffer), stdin)) {
+            return 1;
+        }
+        input_buffer[strcspn(input_buffer, "\n")] = 0;
+        
+        if (strlen(input_buffer) == 0) {
+            strncpy(result, default_path, result_size - 1);
+        } else {
+            if (strlen(directory) > 0) {
+                snprintf(result, result_size, "%s%s", directory, input_buffer);
+            } else {
+                strncpy(result, input_buffer, result_size - 1);
+            }
+        }
+        result[result_size - 1] = '\0';
+        return 0;
+    }
+    
+    // Set up raw terminal mode
+    struct termios raw_termios = orig_termios;
+    raw_termios.c_lflag &= ~(ECHO | ICANON);
+    raw_termios.c_cc[VMIN] = 1;
+    raw_termios.c_cc[VTIME] = 0;
+    
+    if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_termios) != 0) {
+        // Fallback if terminal setup fails
+        printf("\n%s\n%s: ", prompt, directory);
+        fflush(stdout);
+        
+        char input_buffer[512];
+        if (!fgets(input_buffer, sizeof(input_buffer), stdin)) {
+            return 1;
+        }
+        input_buffer[strcspn(input_buffer, "\n")] = 0;
+        
+        if (strlen(input_buffer) == 0) {
+            strncpy(result, default_path, result_size - 1);
+        } else {
+            if (strlen(directory) > 0) {
+                snprintf(result, result_size, "%s%s", directory, input_buffer);
+            } else {
+                strncpy(result, input_buffer, result_size - 1);
+            }
+        }
+        result[result_size - 1] = '\0';
+        return 0;
+    }
+    
+    // Display prompt and directory
+    printf("\n%s\n%s", prompt, directory);
     fflush(stdout);
     
-    char input_buffer[512];
-    if (!fgets(input_buffer, sizeof(input_buffer), stdin)) {
-        return 1; // Error reading input
+    // Initialize editing buffer with default filename
+    char edit_buffer[512];
+    strncpy(edit_buffer, filename, sizeof(edit_buffer) - 1);
+    edit_buffer[sizeof(edit_buffer) - 1] = '\0';
+    int cursor_pos = strlen(edit_buffer);
+    int buffer_len = cursor_pos;
+    
+    // Display initial filename
+    printf("%s", edit_buffer);
+    fflush(stdout);
+    
+    // Main editing loop
+    int c;
+    while ((c = getchar()) != EOF) {
+        if (c == '\n' || c == '\r') {
+            // Enter key - accept input
+            break;
+        } else if (c == 127 || c == 8) {
+            // Backspace/Delete
+            if (cursor_pos > 0) {
+                // Move everything after cursor one position left
+                memmove(&edit_buffer[cursor_pos - 1], &edit_buffer[cursor_pos], buffer_len - cursor_pos + 1);
+                cursor_pos--;
+                buffer_len--;
+                
+                // Redraw line: move cursor to start of filename area, clear to end, redraw buffer
+                printf("\r%s\033[K%s", directory, edit_buffer);
+                
+                // Position cursor correctly
+                if (cursor_pos < buffer_len) {
+                    printf("\033[%dD", buffer_len - cursor_pos);
+                }
+                fflush(stdout);
+            }
+        } else if (c == 27) {
+            // Escape sequence (arrow keys, etc.)
+            int c1 = getchar();
+            int c2 = getchar();
+            if (c1 == '[') {
+                if (c2 == 'C' && cursor_pos < buffer_len) {
+                    // Right arrow
+                    cursor_pos++;
+                    printf("\033[1C");
+                    fflush(stdout);
+                } else if (c2 == 'D' && cursor_pos > 0) {
+                    // Left arrow
+                    cursor_pos--;
+                    printf("\033[1D");
+                    fflush(stdout);
+                } else if (c2 == 'H') {
+                    // Home key
+                    printf("\033[%dD", cursor_pos);
+                    cursor_pos = 0;
+                    fflush(stdout);
+                } else if (c2 == 'F') {
+                    // End key
+                    printf("\033[%dC", buffer_len - cursor_pos);
+                    cursor_pos = buffer_len;
+                    fflush(stdout);
+                }
+            }
+        } else if (c >= 32 && c <= 126) {
+            // Printable character
+            if (buffer_len < sizeof(edit_buffer) - 1) {
+                // Move everything after cursor one position right
+                memmove(&edit_buffer[cursor_pos + 1], &edit_buffer[cursor_pos], buffer_len - cursor_pos + 1);
+                edit_buffer[cursor_pos] = c;
+                cursor_pos++;
+                buffer_len++;
+                
+                // Redraw from cursor position
+                printf("%c", c);
+                if (cursor_pos < buffer_len) {
+                    // Print remaining characters and move cursor back
+                    printf("%s\033[%dD", &edit_buffer[cursor_pos], buffer_len - cursor_pos);
+                }
+                fflush(stdout);
+            }
+        }
+        // Ignore other control characters
     }
     
-    // Remove newline
-    input_buffer[strcspn(input_buffer, "\n")] = 0;
+    // Restore terminal
+    tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
+    printf("\n");
     
-    // If user just pressed Enter, use the default filename
-    if (strlen(input_buffer) == 0) {
+    // Construct final result
+    if (buffer_len == 0) {
+        // Empty input, use default
         strncpy(result, default_path, result_size - 1);
-        result[result_size - 1] = '\0';
     } else {
-        // Combine directory with user input
+        // Combine directory with edited filename
+        edit_buffer[buffer_len] = '\0';
         if (strlen(directory) > 0) {
-            snprintf(result, result_size, "%s%s", directory, input_buffer);
+            snprintf(result, result_size, "%s%s", directory, edit_buffer);
         } else {
-            strncpy(result, input_buffer, result_size - 1);
-            result[result_size - 1] = '\0';
+            strncpy(result, edit_buffer, result_size - 1);
         }
     }
+    result[result_size - 1] = '\0';
     
-    return 0; // Success
+    return 0;
 }
 
 // Editor and file manager implementations
diff --git a/toc.txt.otp b/toc.txt.otp
new file mode 100644
index 0000000..cf08a74
Binary files /dev/null and b/toc.txt.otp differ