Can't fill in pdf form on tablet, yet i can fill in same form on laptop

I created a consent form on my laptop which requires client signatures for consent.  I cannot email them the form as sometimes they have communication difficulties and cannot read it themselves.  I saved the form I created as extended reader pdf (fill n sign).  It will open on my laptop but when I upload it to the creative cloud and then try to fill n sign it on my tablet, it says "Restricted Document.  Modifying the document  is not allowed because it is a read-only file".  However, I did not save this a read-only file and when I checked the security settings, they are open.  Can someone tell me what is going on with this particular form?  I have tried creating it a few times but the same result always occurs.  I can open  other pdf documents on my tablet that I created - but never this one.