Quand je télécharge une image je ne peux pas la lire sur certains téléphones (When I download an image I can't read it on certain phones)

[Taifun]

We already talked in detail about the DOCTYPE error here

Google sheet lire et envoyer les données

This means, your response content is not what you are expecting.... it is the beginning of an error message in html format. . You might want to display the response content in a label to find out more Taifun

You might want to read the suggestions there again...

Taifun