How to auto resize image before upload to server through app

Our purpose is to auto resize upload image by mattermost before sent to mattermost server.

So, question about how to auto resize image before upload to mattermost server through mattermost app. For example: when we use whatsapp for capture image and sent it to chat, it could reduce file size.

if yes, how to do that both in iOS/Android?

Thanks @jimiatworking, appreciate your feedback.

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