A family of Microsoft word processing software products for creating web, email, and print documents.
In spite of the incredibly frustrating responses from these techs -- who appear to not thoroughly look at the informative pleas for help by repeatedly asking questions already answered in the inquiry...
I have found an amazingly Simple solution!!....
Go to Settings > device maintenance > storage > documents > select (all pdf and others you don't want) > delete.
That's it!! So simple!! Less than 2 minutes! Done!!
.... and I am a 55 yr old country bumpkin with absolutely NO computer or tech training!!!
OMG Christine....thank you so much... this issue of not being able to delete files has frustrated me for months and the solution as you say is soooo simple. Why on earth haven't the technical gurus picked up on this!. Sincere thanks!