Hi there, last weekend I worked on adding USB stick support to balenaDash; the idea being that you could load photos from an attached USB drive directly into the RPi.
There are still improvements to be made but if you are interested in checking it out, here it is: https://github.com/tomasmigone/balena-dash.
Based on this adventure, I also ended up writing a quick post on how to handle dynamically plugged devices on balenaOS (link).
Let me know if you have any suggestions, cheers!
Quick edit with additional instructions:
To configure balenaDash on USB mode just set
GALLERY_URL=USBDRIVE . The ‘photos’ app picks up new photos for display with a frequency given by
CRON_SCHEDULE , make sure to update that accordingly (I scheduled it once every 2 minutes for example).