iphone do not permit to send or save a pdf documents downloaded

Hi Raffadoc007

welcome to the Apple (user-to-user) Community!

Re: iphone do not permit to send or save a pdf documents downloaded.

I downloaded a pdf document from one app.

Wondering which app you downloaded from,

and

which iPhone model you use,

and

which iOS version is installed.

Apple Support's online article (link below) may be able to help:

Eg: You can use Apple Books to save, sign, mark up, and share PDFs:

How to: Save and edit PDFs to the Books app on your iPhone or iPad - Apple Support

Also:

In the Safari app , you can mark up a webpage, highlight your favorite parts, draw and write notes, and share your document as a PDF with others. See: How to: Annotate and save a webpage as a PDF in Safari on iPhone - Apple Support

Re: I want to send it by mail but in the dropdown menu the icon of the mail and also the icon of whatsapp are like invisible

Am not sure just where you are viewing the dropdown menu's options:

You can choose which options appear in an app’s Share menu and rearrange the options.

Customize sharing options in an iPhone app - Apple Support

Else: If you wish:

In the Mail app, a .pdf file could be added to an email as an attachment, in order to be sent:

Add email attachments in Mail on iPhone - Apple Support

All the best :-)

Thank you kindly for your thoughtful reply and info. Grateful to know we've helped.

Cheers :-)