Hello @Faerily_Rowanwind, and welcome back to the forum!
Do I understand correctly that you want to select your PNG collection from a Docker and drag it onto the canvas, similar to how it is possible with the symbol libraries, in order to be able to continue working with them?
If so, then take a look at the Imagine Board plugin from @EyeOdin, you can find it in our resources section under plugins.
Michelist