Welcome to the Adobe Express Community!!
I tried to replicate this on Adobe Express Webapp, but it worked fine for me. I was able to download the project as required. Let us know which platform you worked on (webapp, iOS, or Android), and if possible, share with us a screen recording of the workflow that you followed.
Also, would you be able to share this project with us so we can directly investigate the project and provide you with a solution?
If yes, let us know, and I'll then share the testing ID where you'd be sending the invite for this project.