Stuck at 100% uploading

Hello,

I’m uploading a backup file (from all in one) to a site on SiteGround. I’ve hit 100% a few times and it just gets stuck. I saw from previous issues it might be the version, so I downgraded two versions but it’s still an issue.

When I do get to 100%, I see the following in the Developer Console:

Failed to load resource: the server responded with a status of 502 ()
import.min.js?v=6.85&ver=5.1.1:1398 Uncaught Error: error
at Object.error (import.min.js?v=6.85&ver=5.1.1:1398)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=5.1.1:2)
at Object.fireWith [as rejectWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=5.1.1:2)
at y (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=5.1.1:4)
at XMLHttpRequest.c (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=5.1.1:4)

I’m using SiteGround shared hosting which doesn’t usually allow any modifications of the server settings.

Is this fixable?

Thanks