I couldn't download long videos (1 hour) in Adobe Express, but I found the solution and it's better to use Adobe Premier Rush to edit the videos, it's better because it has a desktop application (the Adobe Express one uses the browser and support told me that it has problems at the moment). The good news is that Adobe Premier Rush is included in the Adobe Express subscription as you can see at: https://www.adobe.com/la/creativecloud/video/compare-plans.html?promoid=H822XQ7V&mv=other
I’ve had the same issue with downloading videos after editing or creating them. It’s been frustrating, especially when you put in all that work, and the file just won’t download. I’ve found a workaround using SnapTube APK. It’s not a direct fix for the problem, but it lets you download the videos you need in high quality. Hopefully, there will be a permanent fix for this issue soon, but in the meantime, <a href="https://snaptubesapp.com/">snaptube apk</a> could help!