I published a first small plugin on wordpress.org. I tried to follow all steps but the banner does not appear.
assets folder on the rootNotice : The icon is visible.
what could be the problem ?
The problem was :
I generated images with Illustrator, I got this before saving the image :
translation : "Some file names contains caracters no latin. These names won´t be incompativél with servers and Web browsers"
The problem was, I copied the name from a Web page and that created a non latin caracter.
When I named manually banners with the x key, The name files were different, look at this :
If you are trying to specify the image (icon) that is shown on the plugin's page, then try naming the image file icon-128x128.png/jpg .
Banner images are
Normal Banner: banner-772x250.(jpg|png)
Normal Banner (RTL): banner-772x250-rtl.(jpg|png)
High-DPI (Retina): banner-1544x500.(jpg|png)
High-DPI (Retina RTL): banner-1544x500-rtl.(jpg|png)
See https://developer.wordpress.org/plugins/wordpress-org/plugin-assets/
If the banner (or icon, different things, I know) doesn't show up on the plugin listing page, perhaps the updated info hasn't been synced.
You could try changing the version number in the plugin and readme to see if that will update things. Don't know if just uploading/svn-sync the assets folder will change things on the plugin settings page.
Added
Also, this post seems to indicate that you need two versions of your banner image to support retina displays:
banner-772×250.png
banner-1544×500.png
https://torquemag.io/2014/09/plugin-developers-manage-image-assets/
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