1. Go to your cPanel Admin (a similar hosting panel ‘might’ work somewhat the same)
2. Scroll down to the ‘Software’ and click on ‘Select PHP Version’
3. Click on ‘Switch to PHP Options’ in the top right And TADA! There’s all your PHP Options!
4. Just go down and change the ‘post_max_filesize’ and ‘upload_max_filesize’ to whatever you want, apply and save your changes