@Sannita this will be covered/fixed in T366323

Adding the steps to reproduce the issue (from T364593) :
The message "Please write a more informative title" is a generic message that is displayed to users for all kinds of non-informative titles. As it was reported Commons:Upload_Wizard_feedback#Some_glitches, it might be confusing for users to realize what needs to be done to make a title informative.
Steps

• a user types a pair of single quotes around a title or some words in a title (keeping in mind the wiki markup for italic).
• a user gets "Please write a more informative title" warning

• if users do not click on the link in the warning "See examples" , the issue with writing a more informative title cannot be resolved. The popup provides clear instructions to remove apostrophes (consecutive single quotes).

Checked in commons beta - the more specific warning is displayed:This file name contains invalid characters or format. (Click here) for guidance on correcting this issue.. The popup provides more info on why a title has invalid characters and how to correct the error.