I´m making a game but I need help since I´m new and my question is that: how can I attach a capx? Thanks
Looks like you have to use a third party platform, e.g. dropbox, but I've seen a ton of different ones used.
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Scirra has removed the option to attach attachments. I don't know why. So you have to use a third-party site (Dropbox, Google Drive, Box, Copy, Onedrive, etc.)
As the others have said, just use another source as a way to share your file.
I recommend DropBox. It's what most people around here use and it's really simple to upload and share the link to your file!