- copy the transfer file to the mod’s stash dir
- open the copy in GD Stash (the dir the stash is in is shown in the drop-down list)
- select the mod for the stash (drop-down list between the selected stash and the displayed content)
- save the change
I believe changing the mod of a stash will automatically move the stash into the proper dir (if no such stash exists yet), otherwise you get an error message (as it exists already), haven’t done this in a while however… the above method will always work, as you first overwrite the mod’s stash if it exists already 