I have just upgraded Ubuntu from 18.04 to 20.04
I copied my Chromium profile from my 18.04 install (was a .deb package install) - which in my case was everything in ~/.config/chromium
After searching I found that if I copy from from:
~/.config/chromium/Profile 1 to ~/snap/chromium/current/.config/chromium/Profile 1
I would get all my save profile data back into the snap Chromium installation.
On my 20.04 Snap Chromium installation I do not have /.config file.
EDIT: My workaround is install the old deb Chromium from here: https://fosspost.org/tutorials/chromium-deb-package-ubuntu-20-04
And then I was able to copy my old 18.04 profile.
But it would be great to get my profile/saved bookmarks etc from the old .deb pacakage of Chromium to the new snap version.
Thanks..