Can you try removing the audio file just in case it’s causing a problem?
Also, is there any error message? If so, please provide a screenshot of it.
The rendering process first quickly exports all frame images to the target folder and then ‘calls’ ffmpeg, telling it to make a video file from all images in the target folder.
That can cause problems if the target folder is a live ‘cloud’ storage folder.
I recommend creating a folder called ‘Rendering’ on the desktop and having that as the target folder.
If the rendering process goes wrong, you won’t end up with a very large number of frame images scattered over your desktop or anywhere else. They’ll be in a folder you can see on your desktop, then you can delete it and make a fresh empty one for the next try.
Some people have their personal data folders set to be automatically included in OneDrive. I have a vague memory that Windows can ‘helpfully’ and automatically include the desktop as part of it’s continuous OneDrive cloud backup process.
I suggest that you check and make sure that wherever you decide to render a video to is not included in OneDrive’s activities.
There is a problem with rendering from a frame later than frame-0 when the animation has a large number of frames. This has been reported.
A workaround for that has been described here:
Krita wont fully render the animation - #6 by AhabGreybeard
Can you download this short and simple testing animation?:
TestAnim-0-9-solid.kra
Play it to check it works then try to render it, to a location not affected by OneDrive.