Adobe acrobat app not opening on iphone

I have downloaded the adobe acrobat app for my iphone 7. Previously I was able to download pdf documents and open them from the app. However, now when I select the adobe acrobat app, the home screen freezes, on the symbol with Adobe Acrobat Reader and nothing happens, even if I leave it open for 5 minutes.

I've tried deleting the app and downloading a new version about 5 times. Each time I close the app fully, but the same issue recurs whenever I try to use the app.

Is there a way around this?

Thanks.