Patching collection record does not update the record item

[dunkenshado]

Hello aliens,

I am struggling with a Patch function, using which I want to update a particular value in my collection. I'd be really thankful for the help.

Background: OnStart of app I am initiating a collection as follows:

ClearCollect(localSampleDetailsColl, Defaults(HMTC_Automated_Samples_Shipping_SampleDetail_lst_DEV), {RowSeq:0}, {attachPresent: false})

Further inside the app, there is a form that I leveraging to attach documents to the same sharepoint list's item. 

OnSuccess of the form submission I want to update the value for custom column attachPresent: true using the formula below:

Patch(LookUp(localSampleDetailsColl, ID = SamplesDetailGallery.Selected.ID), {attachPresent: true})

Issue: Although there are no errors in the formula (even in the runtime), the patch does not actually update the record in the collection. Although, when I hover over the OnSuccess formula, the patch righteously shows that it has updated the value:

 Image for Value in the collection:

Note: I cannot use 'HasAttachments' property because the collection is not refreshed after the form is submitted. I cannot re-collect the collection because it has some temporary data that will be lost.