Flamingo How create a shortcut on the homescreen to a specific folder? Activity Manager might be able to do so. But it seems some of the actions need ROOT, which isn't supported of course
Dumdum Flamingo A gallery app (such as Fossify Gallery) can let you make folder widgets. As for non-media files, maybe theres file managers that can do the same?
calpurtmun Material Files has this feature. Use the share menu to add the folder as a homescreen shortcut.