I don't use the default file explorer on my Motorola Moto G7 Plus, I always use X-Plore File manager, but if I'm right, the default file manager is Files by Google.
Anyway, I tried both to open with MediaMonkey a track stored on my SD card: and it works.
Website "Le Geek du Cerisier" : MediaMonkey
MMW on desktop PC: Windows 10, MB MSI MAG B550 TOMAHAWK (MS-7C91) (AM4), CPU AMD Ryzen 5 5600G with Radeon Graphics 3.90 GHz, RAM DDR4 16 GB, SSD M.2 SK-Hynix SSS0L24765 512 GB (C:), 3,5" Seagate ST1000DM003-1CH162 1 To (D:)
MMA on 4 Android devices - MMW5 gold in test... - MMW4 gold used for years (with extensions: AdvancedReport, Album Art Tagger, CustomFieldsTagger, Custom Report, Discogs Tagger, French translation, GenreFinder, Last.fm Scrobbler, Lyricator, MM codec pack Trial, MusicBrainz Tagger, MusicIPTagger, RegExpFind and Replace, Tagging inconsistencies)
Hi,
I can see in your log "No space left on device", so it means that the storage is evaluated as read-only.
Free up storage space and then restart MMA