Puddletag-snap can't see files on NTFS drives

Really puddletag-snap does not have access to removable media, there is no such plug in its manifest file. You have to ask Snap developer to add it.

So you have two options:

use puddletag 1.2 from official repository on Ubuntu 18.04 LTS by

sudo add-apt-repository universe
sudo apt-get update
sudo apt-get install puddletag

use puddletag 2.x from PPA on Ubuntu 20.04 LTS (package for 18.04 LTS also exists) by

sudo add-apt-repository ppa:savoury1/multimedia
sudo apt-get update
sudo apt-get install puddletag

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