Image of summary_large_image not showing in tweet

[Barbora]

When I use Card Validator, everything semms to be ok, just an image does not show. The same when I´m twittering the URL.
We have this trouble all over the web.

One article for example: https://www.clovekvtisni.cz/en/what-we-do/humanitarian-aid-and-development/syria/syrian-school-supported-by-people-in-need-destroyed-by-airstrike-as-fighting-in-idlib-and-aleppo-governorates-escalates-4598gp

Card Validator says:

And tweet look totally the same, what we are doing wrong?

[andypiper]

Have you been through the troubleshooting post?

Not Whitelisted, unable to render, or no image: READ THIS FIRST

if your image is not showing, is it accessible on a URL that is not blocked by your robots.txt file? Does it conform to our size constraints? Are you using an absolute and full URL (including the http protocol piece), not a relative one?

[Barbora]

Thank You!
I´ve not found that pos and i did not know there must be full URL with protocol (we were using //www… instead)
It is working now.

Thank You very much and sorry for not reading “READ THIS FIRST”.

B.

[andypiper]