Add Media in edit portfolio

Hello everyone
I have my website running for at least 5 months know and everything worked perfectly until yesterday.
When I create a new portolio everything works just fine, sections, texts, details etc…..
But when I click on the button + add media a window open with all my photos, then I can upload and select the photos I want in my portfolio.
Once the selection is done I clic on the button “select” down right of the window and the window closed but the photos I selected isn’t showing !!
So impossible to add photos in my portolio why?
What can I do please ?
I am a photographer
Thank you all