I swapped out my ssd and downloaded the battle.net app with WC3:Reforged on it. It seems that the files were lost in transition- it must not have been saving to my account and saving natively. I actually ran the game previously on my D: drive and it is still accessible on my rig. I’m wondering what files the campaign files would be in and if they’d be transferable if I just did a simple copy paste from the D: drive to my new ssd?
Easiest way is to copy the WC3 install folder from the previous SSD and paste it to the (preferably Program Files [not x86 so WC3 runs in 64 bit]), then open the Battle.net app on the new drive, which should automatically find the install directory, and it not, just guide it
Campaign progress is only stored locally. Thus, if you install to a new computer/drive it won’t transfer, so you’ll have to copy it over. This post is about backing up campaign progress, but it applies to copying it over as well: