Overwrite meta og:image image source to use externally public loaded images on topics?

[david (David Taylor)]

@Faizan_Zahid

If they are hosted on S3, then how are they uploaded on Discourse?

By setting it up like this:

Configure an S3 compatible object storage provider for uploads

This topic covers how to configure some common S3 compatible Object Storage providers (S3 clones). See Set up file and image uploads to S3 for more details about Amazon AWS S3 configuration, which is officially supported and used internally by Discourse for our hosting services. Provider Service Name Works with Discourse? Amazon AWS S3 Yes Digital Ocean Spaces Yes Linode Object Storage Yes Google Cloud Storage Yes Scaleway Object Storage Yes Vultr Obj…

@Faizan_Zahid

it is also a public server to host images. When i use remote images from 3rd party free image public CDNs then they are also accessible by anyone, same with S3. Then why does Discourse not allow / support the public images URLs to be used as topic thumnails?

Because Discourse does not have permission to access the S3 bucket and optimize the images for display on the site. Discourse also cannot guarentee that the link will always work - the person who owns the bucket could delete the file.