How do I downloaded my bank statements
Please confirm if you are downloading the statements from a web browser or an email.
In the case of email, can you please follow the step mentioned at Acrobat Reader Help for Android: Opening PDFs.
And in case of chrome or any other web browser please follow the steps at Acrobat Reader Help for Android: Opening PDFs
Please let us know if this doesn't resolve your issue.
Adobe Acrobat Team