I want to use regular share button like on this page https://twitter.com/about/resources/buttons#tweet but to add an embedded image from my site, not just link.
I know all about 1.1 api and uploading, but making an tw application and then ask visitor on my site to give permission to write on his timeline just to share one pic from my site is not likely scenario, so I think about alternatives.
I've noticed when just paste links of pic that are already uploaded on twitter into tweet, if you paste link like https://pbs.twimg.com/media/BPpk_KUCMNBXsPN.jpg
that is not going to be embeded, but if you paste link like this pic.twitter.com/NuDSx1ZKwy
it will be embeded. So I think if I make profile and app that will call https://upload.twitter.com/1/statuses/update_with_media.json
and upload pic, and then paste link in share button I will get tweet with pic embeded. Or there is better way? I use php.