Is it possible to mention an attachment when you are adding comments/activity just like you can mention other members and cards?
When you change anything in a card it is automatically shown as an activity.
There isn't a way to specifically mention an attachment, but you can mention a member anywhere by using @MemberName. So you can just say something like:
@John Doe, check attachment WireFrame.Jpg
@John Doe, check my last activity (being that it was the attachment)
First you should find the actual link of the image by Ctrl+Click, Copy the image url, Then add the image as follows.
This is an [image.png](https://trello-attachments.s3.amazonaws.com/*****************/image.png)
The text will looks like
This is an image.png
and when click on the image.png the image will get open as a popup.