Hi.
By any chance did you update the desktop apps? If you did, that could be one reason that sending stopped working.
Give this a try (perhaps on both computers but certainly on computer a):
First, since it has a lot to do with whether files make it to the desktop, make sure you're using version 4.7.0.400 of the Creative Cloud Desktop App; to check that version, tap on the CC icon in the menu bar, then the Gear icon, then Preferences.
Then try signing out and restarting:
1. Sign in with your Adobe ID to https://assets.adobe.com/assets/mobile?filter=draw and make sure all the work on your device is synced to Creative Cloud.
2. Then, on your desktop, close out of all desktop apps and log out of the Creative Cloud Desktop App (tap the CC icon, then the avatar icon, then Sign Out), restart your laptop, then log back in to Creative Cloud)
3. Before you try to send from Draw, sign out of the app, (tap the Settings icon in the lower nav, then the field with your name, then Sign Out), restart your device, then log back in to the app.
4. Once everything's running, try sending from Draw to the desktop again.
Let me know if that solves it.
Sue.