Filesystem creation problem on OMV 5.3.9​ [SOLVED]

Hi, I'm new here.

I just downloaded and installed OMV 5.3.9,

I've done the basic configuration (update, ip address setting etc..)

And I would like to create a file system (not a RAID).

So I go to file system, I click on create, the window is displayed, I select the hard disk, its name and the type (ext4) I validate, a new window opens with the progress of the creation. At the end I have a message telling me that the creation is done successfully...

BUT the file system is not displayed in the list, I tried with 2 different hard disks I tried in EXT4, EXT3 nothing to do.

I'm new and I'm not a pro so maybe I'm doing something wrong... but I don't see what.

I need your help please.

PS: I'm French so sorry for my English which is not at the top...

Thank you for your help

Great. It worked. Thank you so much for your help.