Can I use a backup from 2.10 to restore to a fresh install of 2.11?

I have a FreePBX 2.1x that has problems. Asterisk is working, but FreePBX (was 2.10, problems with upgrading to 2.11) is not allowing me to access the web GUI. I’m tired of messing with it, so I installed a free FreePBX Distro (32B, latest as of today - 4.211.64). I’m trying to restore the config from a 2.10 FreeBPX backup.

It uploads it, no complaints and any messages, but the configuration seems to be unchanged, e.g., no extensions restored, or any other changes that I can see.

Should this work? What am I doing wrong?