Gallery/collection not visible when record is initially selected/viewed in customized form (X-post)

RobElliott, 

In the OnStart property, I have: 

ClearCollect(col_AllRequests, SortByColumns(SalesRequestsForm, "ID", Descending));

ClearCollect(col_AllItems, SortByColumns('Sales Item List', "ID",Descending))

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In the OnView property, I have:

Set(var_selectedRecord, SharePointIntegration.Selected);

ClearCollect(col_ItemView, ShowColumns(Filter(col_AllItems, var_selectedRecord.ID in 'Request ID'), "ItemName", "ItemDescription", "ItemQuantity"))

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In the Items property of the gallery, I have:

col_ItemView

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Fyi, the 'Request ID' column is a column in the 'Sales Item List' and is populated using a Patch statement when a record in the 'SalesRequestForm' list is created.