Where is the Alt tag in the File manager?
Without alt - screen reader will say the name of the file for example "Sfdfdf235545wow". Anti pattern :(
I see the alt in 2 places:
1) Add "Image Block" --> set alt
2) In "Content block-->Add pic --> click Edit on it --> set alt
But what about the file manager itself?
The alt of the same pic can be difference in two places (The surrounding content matter) - but in "real life" one default alt can be ok (and if you want override it)