If the Primo is restarted, branding may not be appropriate. Or most likely bad compressed.

You can modify it yourself, but....you have to follow certain rules well
First - the easiest is to use some existing ones, small sized branding.
Second - you have to create your own thumbnails very carefully. Appropriate format, appropriate type, appropriate size and resolution.
Third - you must replace existing pics by not disrupting the existing zip file. This means that you must in no way change its compression or otherwise modify it. It is the easiest and most reliable to use Total Commander (or Double Commander). Or WinRar 3.93.