How to send photos or other files on Skype using a computer or mobile device

To send files on the Skype desktop app, you can simply drag files into the app. On a phone, you can only send photos.
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I found an open-source app like Obsidian, except it's better

Discover why Zettlr, an open-source writing app, offers a cleaner and more focused alternative to Obsidian for academic research and Zettelkasten methodology.