TOPIC:

License in activated at the App Start and it's a Professional License.
I check if all the method return true but It's seems so.

it's a Professional License

That is the problem, form field editing is available only with a premium license.
So with a professional one, it won't work.

I checked.
License Premium activation correct and document.Save return True

It's possible to have a demo in Xamarin for test save on doc? So I can check difference between our version and mine version

Hi,
here you will find the demo project for Xamarin : github.com/gearit/RadaeePDF-Xamarin
This project is activated with a demo Premium license.
You can edit the main activity with your pdf path and then with the "open button" you can open and edit the pdf then save.
You can also edit the main activity to open pdf via stream.

I try the Demo with files of mine and when I tap on Open From Asset I have message "PDF not valid or damaged.." WHY? Tried with different pdf file all with same error.

I attach the pdf

In case of open from assets, the demo pdf is opened usingSo you need to change the pdf name according to the one you are using.

Note: Open form assets is a read only mode, you won't be able to edit acrofields.