WebClient > Picture Box Page Part > Import function
Press import button > A file choosing dialog shown up > User select a file from file explorer > OK
=> A blank message is shown up right after user uploaded picture.
It is not equivalent to Window Client behaviour which act silently and display the imported Picture immediately
Debugging let me to other clue that NAV standard UPLOAD function involved in the matter.
P/S: User must press OK on blank message box then press Cancel on File chooser Dialog in order to move back to Page Card.
It is so annoying
Web Browser: Chrome
Answers
"UPLOAD and UPLOADINTOSTREAM
Partially supported.
The DialogTitle, FromFolder, and FromFile parameters are not supported.
Not supported on devices that run on Apple iOS, such as iPad. When you try upload a file, the dialog box for uploading a file appears in the Microsoft Dynamics NAV Web client, but it is disabled and you cannot select a file."
https://msdn.microsoft.com/en-us/library/hh168959(v=nav.90).aspx