I noticed and deliberately kept the "Not now" default choice. That implied I could change it later. Which the pre-sign-up text I quoted, also seemed to say.

So I was confused I couldn't find or do this, later.

(I'm not trying to give you a hard time. Just offering n%b user feedback.)

Thanks. I'm going to have a look through the site copy and see if we missed anything when we moved the "migration" option to be a PRO feature.

We do offer migration between storage providers at https://trovebox.com/migrate. It is new-ish so we don't have prominent links for this but one of our important features. You can upload 20,000 photos and then one day decide, I don't want to use Dropbox anymore.