Auto generated map screenshot is invalid size.

[Vertu]

I have already tried messing with the auto screenshot to make it "smaller" not that I know how besides cropping the image (which did reduce it's file size) but it has solved nothing.
I have the original auto-screenshot still saved.
Trying to upload the map I get this error message: "Thumbnail size invalid: 773745".
I do not touch game files and this mission was no different. Only touched after getting that error message.

[Karsten75]

It would be really helpful if you would consider attaching the log file and the save.cw4 files to a problem report that you expect assistance with. Saves guesswork.

[Vertu]

I was expecting more of an insight as the problem is very simple and seemingly straight forward considering I basically may of got an error code but here you go.

I also included the prev.log just in case.

[knucracker]

You can try the upload again.  The server has a size limit on the number of bytes in the thumbnail image.  That was just a tad too low for this particular thumbnail.  I've raised the limit so the upload should go through

[Vertu]

Switched back to the auto-generated thumbnail, went to upload and it all went smoothly.