Questions regarding MP4 compression breaking Puzzles UI behavior

Hi everyone,

I am developing an interactive app and recently encountered a strange behavior after replacing my video assets. I would appreciate some insights on the following three questions regarding video compression, Puzzles behavior, and the publishing workflow:

1. Why does replacing compressed MP4s cause erratic UI/Object visibility issues when Puzzles remain unchanged?
I have an interactive layout where clicking a button triggers a video playback and simultaneously changes the text/visibility of a UI object (a text strip named “3M Tape”).

When using my original, uncompressed MP4 files (total folder size ~96MB), the app works perfectly every time.

However, after compressing the videos into smaller files (using HandBrake) and overwriting the old files with the exact same filenames, some objects/text on the “3M Tape” start behaving erratically—sometimes they show up, and sometimes they don’t (randomly appearing and disappearing for specific characters).

The Puzzles logic was not modified at all. If I swap back to the 96MB original files, everything instantly works fine again. What could cause the compression characteristics of an MP4 file to affect the execution or responsiveness of subsequent object/UI logic in Puzzles?

2. What are the recommended HandBrake export settings for Verge3D web applications?
To avoid compatibility or decoding issues that might be causing the problem above, what is the officially recommended video configuration when using HandBrake? Specifically, which combinations of the following settings are considered standard and safest for a flawless WebGL/Verge3D experience:

Format & Extension: MP4 vs M4V (and whether to check “iPod/iTunes friendly”)

Video Codec: H.264 (x264 / Hardware Accelerated) vs H.265 (x265)

3. Is there a way to selectively upload individual files to Soft8Soft App Manager instead of re-uploading the entire project folder?
Currently, every time I make a minor update or compress a few assets, publishing requires uploading the entire application folder through the App Manager interface. Is there an efficient method or workflow to only upload/update specific, individual files to the Soft8Soft network server instead of transferring the whole folder every single time?

Thank you very much for your time and help!