Hi,
I have passthrough video file that has "_alpha" in filename. When viewing directly from local Quest 3 storage, the alpha channel works ok. However when I view the file via URL link on NAS (e.g. http://192.168.../video_alpha.mp4), there is no (A) button present to enable alpha channel.
Tested on newly released version DeoVR 13.12.2.1. I suppose that version fixed similar issue with DLNA videos, although is the fix including also local HTTP links?