I installed Mayan EDMS on my ubuntu server and it is pretty convenient

1. I installed the scanner on my server and it works correctly.
2. I get the device address :
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hobbit@mayan:~$ scanimage -L
device `brother4:net1;dev0' is a Brother MFC-J5335DW MFC-J5335DW
4. Then I go to "Documents" \ "New document". I can see the new source item "Brother" but when I click on "Scan", nothing happens.
Do you have any idea where I could find some log to see where the problem is ?
This post has been already helpful (viewtopic.php?f=9&t=161) but I am still stuck

Thank you for your help,
Hobbit