Yes, if iCloud is visible in Textastic, then there should be a Textastic folder in iCloud Drive.

Textastic does not currently save files in "Recently Deleted" in the Files app - I'm not sure if this is actually possible.

But, if the file was uploaded to iCloud before it was deleted on the device, it should be recoverable on the icloud.com website.

Thanks, I can confirm the bug. I’ll try to find out how this could happen. 

Textastic 6 was released as a new app, so you likely never deleted the old Textastic 5.3.1 version. You can safely delete Textastic 5.3.1 (the old icon has a bottom "shadow" while the icon of the new app doesn't).

Ok, that indicates that iCloud sync does not work properly and files do not get uploaded. I’d first try a reboot of the device. 

Ok, then I don't know what's going on, sorry. I'm not aware of any data loss issues in Textastic.

Are you on iOS 13 by any chance?

Is this on iOS 12 or iOS 13 beta? iOS 13 is not supported yet.

Maybe the folder was not uploaded to iCloud yet. Otherwise they should be there on icloud.com.