uploading images and deleting them

Yes, if you delete the image from the media library, it removes them from the library and thus will disappear from your site.

Additionally, the images that you upload are located in the wp-content, not wp-admin. Don’t delete anything from the wp-admin folder.

Ok thank you Christine ??

and just one more question… when I upload picture or pictures it
shows me an http error…
but picture is nevertheless upload and can be used…why is that?

I cam across this link by doing a google search – https://www.chewie.co.uk/general/wordpress-image-upload-http-error/
Could this help?

I added this line off code in.htaccess

<ifmodule mod_security.c=””>
<files async-upload.php=””>
SecFilterEngine Off
SecFilterScanPOST Off
</filter>
</ifmodule>

but didnt help ??