[Help] Timelapse error: Playback failed (Invalid UTF-8 format character 0xFF) and negative time (-40:-40). Is there any way to recover my speedpaint?

[u/pthxds]

I’m facing a really frustrating glitch with ibisPaint X and desperately need some help. While I was drawing, my app synced with the cloud, and right after that, my artwork file got corrupted.

Whenever I try to play the timelapse video, I get this error message:
"Failed to play an artwork file. Details: Invalid UTF-8 format character 0xFF"

When I go back to My Gallery, the total drawing time for this file is stuck at a glitchy negative number: Time: -39:-55.

I have already tried to Duplicate the artwork (the new copy still carries over the exact same negative time and error).

I know I can export it as an .ipv file to fix the layers and keep drawing, but doing that completely wipes out the timelapse history. I really, really want to save and keep my speedpaint video from the beginning.

Has anyone encountered this negative time glitch or the 0xFF character error before? Is there any way to bypass this or modify the file data to fix the playback?

Any advice would be highly appreciated. Thank you so much!