I have worked around it by unzipping the dump on the target server and importing using the sql command line, which, now I've included that in my sync script after I rsync the content across from the old server, is more straightforward than having to go via the control panel. No urgency from me...
Further information from stderr, from the Task Manager
[2026-06-29 15:32:56.240] 12640:6a42821833943 ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/filemng' 'catdata' 'perm2cp' '/var/www/vhosts/test.catalyst-data.co.uk/catdata_2026-06-29_13-20-53.sql.zip'...
We're in the process of migrating sites from Plesk on CentOS 7 to a new Debian 12 server. I've been rehearsing transferring database dumps using Export dump on the old server, and Import dump using "Import a dump stored on your hosting server" on the new, using *.sql.zip file(s) copied to the...