About image posting:
UPD:
- I thought that the matter of reputation, but it's preview shows just an abridged version.
- https or http doesn't matter.
- Images does not necessarily to be uploaded to Imgur.
- You can use google drive, but even direct picture to be shown must be posted with markdown or html tag.
- If Steemit informs your "Image URL does not appear to be valid: undefined", you probably uses invalid tag, or valid but not on purpose.
Direct link without markdown on a separate line:
Styled with markdown ""
HTML img tag with width attribute: