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After last update of the iOS app (9th December 2019) I was not longer able to open PDF create with "Any DWG to PDF Converter PRO" (http://anydwg.com).
Same problem on different devices like iPhone, iPad or iPad PRO.
On Android or Windows no problem.
Previus converted files, with whom I had no problem, now they freeze the app.
If you recently updated your iOS review if you are following the proper steps.
You also mentioned that you were using anyDWG to PDF Pro; review if your paid subscription for that software need to be changed in the Apple App Store:
Additionally, you may also want to contact anyDWG support and find out if they can provide you with further guidance about system requirements and support for iOS.