PDFs exported cannot read on Android

The PDF files exported are not open by any Android application.
Also I have problems to the PDF files to be accepted on some web site services.

I can open it with different Windows / Linux systems .

I was using version 6 of Libreoffice and then updated to version 7 and it is the same.

I suspect the issue is the Linux platform. Does any one has some hint how to fix it?

by any Android application.

And which ones did you try? I have no problem with AnDoc, for example.

PDF files to be accepted on some web site services.

Contact their admins / maintainers. It does not make much sense complaining here.

If I send to a regular person, they will open it with google PDF reader or something that comes on their phone… and they are not able to open the file. It says is unrecognizable. Same with some some web services I tried to upload a PDF file. However, softwares on PC can open the PDFs.

Then let them use another app, see above. EBookDroid is fine, too, in my experience.

I believe I found the problem is related to mine Linux installation.
For some reason uploading PDFs files with this installation are creating issues of some reasons…

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