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I have never once seen anybody actually specify which hosting site they've used in their posts unless it's something like this. I've also never seen confirmed dropped image links either, just broken links to what appeared to be people trying to upload incompatible image formats, or them making another error in the process at some point. I don't know how you verified that this wasn't the case, and that they didn't use https://www.steemimg.com for the "dropped links" but either way https://www.steemimg.com seems like it's good, so I don't think you can go wrong either way. I acknowledge that https://www.steemimg.com was designed with Steemit in mind so I'm sure it's comparable in reliability to the Steem itself. Therefore it should be good.

Hi dude, There are lots of site has also markdown like html code. But it's need it first of knowledge that how to use it!
Any way such of above information is very important.

that's why I called it "promising," as it was designed with Steemit in mind and from a community member. Time will tell, though :)