I just noted that Dev Channel version 68.0.3437.0 fixes the broken Terminal app for Project Crostini and thanks to DennyL, I found out that the Linux files automatically mount to the Chrome OS Files app in this version as well. That means no more workarounds using the SSH app!
I didn’t see this at first for one reason: There’s a flag to enable the feature. Make sure you type chrome://flags in your browser and then enable the #crostini-files flag. Restart and you should see a new Linux Files mount in the Files app on your Chromebook. Thanks DennyL!