How can I prevent screenshots of my file on Nextcloud when sharing it?
Your question is not clear for me.
Please explain in detail.
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You cant prevent that. Imagine, how would you prevent, that someone is taking a photo of their monitor with their smartphone?! For screenshots apply the same rules
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Additional they can also download it. Every HTTP-request is a download.
You need watermarking for all file types. Part you can find at Secure view - Prevent your shared files from getting downloaded - Nextcloud
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Thank you so much