'Unknown format'

[paul0015]

Hi all, I am new here. Glad to join the community!
There's a PDF file that I've been working on for month, most of which was written on my Samsung Galaxy J2. But since I have uploadea Android, I cannot open it. The file gives the following message: 'Unknown format'.
May I know has anyone got this error?

 

[me just sayin]

what app were you using to write the pdf? maybe check the file extension to see if it is being saved as a pdf. also try it on your computer and see if acrobat will open it.

 

[PereDroid]

How do you "work" on a PDF? What program or app did you use on the J?

Sent from my Moto Z (2) using Tapatalk

 

[miga10]

How to View PDF Files on an Android Phone:
1. Download Adobe Acrobat Reader on your Android smartphone in GooglePlay.
2. If the file is damaged try to recover pdf HERE.