To configure the Customer Files Uploads & Product Attachments add-on, locate the add-on on the My Apps page of your store's Admin area (Apps > My Apps) and click Settings:
The add-on settings page provides the following properties for configuration:
Max number of files that can be attached: Specify the maximum number of files a customer can add.
Allowed file extensions: Provide a comma-separated list of file extensions that should be allowed for upload, for example, JPG, TXT, and SVG.
Max file size (MB). Set to "0" (zero) for unlimited: Set the maximum file size.
NOTE: The PHP settings upload_max_filesize and post_max_size may impose limitations on the maximum size of file uploads if they are lower than those specified in the add-on settings. To increase these parameters, edit the file php.ini or contact your server administrator for help.
Click "Submit" to make the settings active.
Now you can go ahead and enable customer file attachments for products.
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