@Mimikyu007_OwO Hi. Sorry to hear this. We’ve done this in the past haven’t we?
I recall I gave you a warning back then that for large projects it’s a must to save multiple files instead of saving to a single file in order to avoid this problem as it was bound to happen.
This is particularly true now, and more than ever, since Windows 10, macOSX 10.15 and Linux distribution systems have become more and more aggressive when dealing with external apps (that is applications that are not installed from their “approved” software manager or app stores)
Anyway. As usual the only way we can help is if you share the file and we recover what we can. Please use wetransfer.com to upload the file, and read this guide to learn how to use the anonymous link option https://wetransfer.zendesk.com/hc/en-us/articles/115004254743-How-do-I-send-a-link-transfer-
We’ll only be able to recover whatever is inside the file, but if the animation was too long, since Pencil2D saves from the last frame to the first, a portion of the initial part might have been lost. Since you mentioned that you have an exported video you can use a video editor to fill in the blanks.