Won't detect ROMs from usb drive

[Dirk-GitHub]

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What's wrong, and with what software version?
TI-84 Plus CE version 5.7.0.0021. I have all of my ROMs on a USB thumb drive, since my calculator ran out of space, and the TI-Boy CE won't detect the bundles.
TI-OS version: … (see in 2nd+mem ->About)
TI-Boy CE version: … (shown on the TI-Boy menu, or if you built it yourself please specify which commit)
Describe your issue:
… (including, if applicable what you expect vs. what happens)

What are the steps to reproduce this issue?

1. put rom bundles on a USB drive
2. open it with cesium
3. app says no roms found

Any logs, error output, screenshot, other comments...?

no, not really

[calc84maniac]

Loading ROMs from a flash drive isn't supported because there isn't enough RAM to load into. You'll have to copy the files for a ROM to your Archive storage. Also, I don't believe Cesium can handle bundle files, so if you want to copy files via Cesium you'll have to unzip them first.

[adriweb]

You'll also have to delete anything you don't need/use from the archive (maybe localization apps, or some apps you don't use?) in order to have more room