Drawers have before load actions. You should be able to add a before load action to activate and set the value of a model condition. It will respect row context so you can typically use {{Id}} as the value for the condition. Then you need to requery that model. This way, every time you open a new drawer, it will limit the rows to those that match that row.

Thanks Raymond. I added the before load condition and when i try to preview the page, i’m getting the following error.
How to overcome this error?

Best guess is that it is one of the fields you are including in your model. I would eliminate one field at a time from your model and test.

This heap size error is indicating that the query tried to pull more data than Salesforce allows at once, which is capped at about 6 megabytes. When you’re setting up your model to pull the attachment, you will actually want to use the relational field, which looks something like this:

Invoice__r.skuid__AttachmentId__c

If you simply try to use Invoice__c itself in your model, the query tries to pull the file’s actual data/code encoded into Salesforce. Instead, try using the tfieldname]__r.skuidAttachmentId__c field to serve your attachments. 

I’d also like to encourage you to check the context conditions on your drawer, and make sure the context is doing its part to make sure the drawer will have the relevant content for its associated record. The tutorial here should help; specifically right around step 5. 

It Worked. I solved this Heap usage limit error. I made the changes as per what you said on top. But still the Attachments related drawer is not working as expected. the condition and before load action that i am using now looks like this I also Added a context condition when the drawer opens. that condition looks like this Whenever i have a context enabled, the table is completely empty (no records within the attachments is showed up). When i don’t have the context condition, all the attachments records are showed in the table. Where am i going wrong?