Hi @Fabor15! These values can be edited in the php.ini.hbs file within the site’s conf/php/ folder.
If you click on Site Folder in your Local app (underneath your site’s name), then click on the PHP file, and you’ll see a php.ini.hbs file. You can open that in a text editor of your choice (I use Sublime), and adjust the upload_max_filesize value, and then save that file. After that you’ll want to Stop the site in Local (upper right hand corner) and then Start it again so that Local can refresh those changes.