Add platform support note and existing file handling documentation to README and skill docs, clarifying Windows 11-only testing, per-script ffmpeg/ffprobe requirements, and file replacement behavior with -y flag across Clone-Image.md, Clone-Video.md, Compare-Videos.md, Crop-Clips.md, Get-VideoAudio.md, SKILL.md and index.md

skill/Clone-Image.md

@@ -197,6 +197,13 @@ The output format is selected from the `-Target` file extension. Each format has
 - **JPEG output is always 4:2:0 chroma** (`yuvj420p`). If you need 4:4:4 JPEG or 16-bit output, edit the encoder args directly.
 - **TIFF and BMP** are stored uncompressed (TIFF can be configured for LZW/Deflate via additional ffmpeg options if needed).
 
+## Existing Files
+
+- An existing `-Target` image is **replaced** without a prompt. ffmpeg runs with `-y`, so the old file is lost. Use `-WhatIf` first, or write to a new name.
+- An existing file at `-Keep` is replaced in the same way.
+- The folders that contain `-Target` and `-Keep` must already exist. The script stops with an error instead of creating them.
+- The temporary upscaled PNG is deleted when the script finishes.
+
 ## Safe Execution
 
 This script supports `-WhatIf` and `-Confirm` for safe execution: