Hi @Anonymous,
Could you please share more details about the calculation of the AttachmentLink?
Besides, when connected to SharePoint list, there is a way to display the Attachment by the following way:
First(First(List1).'{Attachments}').AbsoluteUri
Add the line above with an Image control, it will show the first attachment of the first item in list1.
If you would like to show all the attachments with a special item, then please consider take use of an image gallery, for example:
Under the Image gallery items property, enter the following:
First(List1).'{Attachments}'
Then within the Image control, under the image prperty, specify the code as below:
ThisItem.AbsoluteUri
Would make it work.

Regards,
Michael