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The max upload file size is also restricted by PHP params: `post_max_size` and `upload_max_filesize`. You can contact your hosting provider for assistances to increase these params. We also have article for this topic here.
In order to increase max upload size for other apps such user profile photo, events, photos, ... you can follow steps in this article but choosing corresponding apps in Manage User Settings page. For example: setting of user profile photo is in "User" app
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Simple steps on how to increase the video size upload in phpFox
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