To increase the WordPress Upload Limit do the following:
Step 1: Locate the php.ini file inside the wp-admin directory (if you’re not sure how to do this, ignore the steps below and contact your webhost who can do this for you).
Step 2: Find the following line in your php.ini file:
Step 3: Increase the value to 64MB or higher and save the file.
Step 4: If you still have issues, look for this file in your root directory and make the same changes.