Do you have Acrobat app installed on your device?
Yes I installed the Acrobat app.
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If you already have the Acrobat Reader for iOS app installed on your iPhone 6 Plus, the Reader app icon should appear as an option.
Please take a look at the "Open from Mail" section of the following FAQ document.
But it does not sound like you've missed any steps.
A possible cause of the problem:
- Acrobat Reader for iOS has not been installed before you tried the iOS "Open in" or "Copy to" feature in Apple Mail.
- The file format of the attachment is not actually PDF or the other formats (Word, Excel, PowerPoint, RTF, JPEG, PNG, etc.) that Acrobat Reader for iOS supports.
- In the popover displaying options, scroll to the right to see if the Acrobat Reader icon is there.
- Your iPhone may be configured for Enterprise usage. It does not allow Acrobat Reader to open a PDF attachment.
Would you please try different PDF documents to see if it's a file-specific problem?
Please let us know what you find.