I can’t migrate the site

Hi
Please forgive English.

I am trying to import a file, but during the import it reaches 0.94%. Then it returns to 0.11% and finally remains at this value and does not continue to matter.

The strange thing is that I have already migrated several sites without a problem on the same server, so I assume that it is not about incompatibility are the PHP 7.4 issues or another thing.

Any suggestions?

First of all, Thanks.