Troubleshooting

Cancel a Subscription or Request a Refund
How to Request a Refund for an App Store Subscription
How to Cancel App Store Subscription on iPhone
[Announcement] Discontinuation of Single Sign-On from LinkedIn, X (Formerly Twitter), WeChat, and QQ
What is the difference between the PDF Reader iOS and other versions (Android, Mac, and Windows 10)?
What is the difference between a free membership and a Document 365 subscription?
Where and how to purchase a Document 365 subscription?
Annotations are not visible when using a third party app
There is no PDF Reader in the "Open in" dialogue
Unable to update PDF Reader
My documents are locked by password with no reasons
Where is the output file after conversion?
Files can not be opened
KDAN PDF Unable to Access Advanced Features After Upgrading on iPhone
PDF Reader app freezes