peachi

No, if it is private best you wait for a Serif employee to respond
You can sue Serif for far more money than you can sue me for 😁

Many thanks for letting me know Kano111 & many thanks for your file peachi
I can confirm I've been able to recover your file, though with one pixel layer that requires replacing.
Under the 'mountain calling' group, you have a Rectangle, which has a Pixel layer nested within - the pixel layer nested here has become corrupted, causing the document to fail to save.
Having replaced this layer with an empty pixel layer, I'm able to save and open the file as expected.
I'll be sending the fixed document to your email address via Dropbox now, I hope this helps!

Hi @Dan C,
thanks for your response. Here is the file. Can you delete it please after you downloaded it? Thanks in advance!!! 
 

Hi @peachi,
Welcome to Affinity Forums
I've edited your post to remove the attached file. I've already got it with me and will log the issue/pass the file to the dev team t0 see if we can recover it.
Next time you need to send a file directly to us (without posting it publicly) simply request an upload link and we will provide one for you so you can keep it private.

Regarding your issue, please avoid working directly on files stored on external USB sticks/drives, and cloud synchronised folders as they may cause corruption/issues in certain circumstances. Copy the file to a local drive, work on it from there then close the file and move it to the external drive to prevent these issues from happening.

This one should open for you
(now deleted)
 

All done