Paste a listing of your plot files in to the text box.
The format is "one file path per line".
Example:
./tess-3T-ba64/plots/16331706345083682069_2201902154208622922_1048576_1048576 ./tess-3T-ba64/plots/16331706345083682069_602228740610547607_954368_954368
On Linux you can generate a compatible listing with:
find -name "$account_id*" 2>/dev/null
..where $account_id
is your BURST account id in numeric form.