By santiagovegacortes on

Hi

I'm new in drupal 8, and I need help.

I am validating the upload of a file with "managed file" and I want to show a message when the user uploads a file with the wrong format. Currently when the user uploads a file with the wrong format it gets red in the title field, I like to show as a drupal set message or something similar.

I appreciate any help, thanks!

⋅ Categories: Drupal 8.x