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Power Apps - Power Apps Pro Dev & ISV
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PowerApps - Saving Collection to Sharepoint Site

Posted on by
Hi,
I currently have a app where I save the Form to a collection if the connection is disconnected.And a "Sync" button with the below instructions to save the file to the Sharepoint site once connected which works correct.
If(Connection.Connected,Collect('TL Reseals',offlinecollect);Clear(offlinecollect);Navigate('Start Screen'))
The above instructions creates a new entry in the sharepoint list, what I require is to update an existing sharepoint entry with the information from the collection. 
I tried the below instructions on the submit button but it cannot lookup the SiteName from the sharepoint list, to the collection SiteName to update the required field.
If(
    Connection.Connected,
ForAll(offlinecollect,Patch('TL Reseals',LookUp('TL Reseals',SiteName=offlinecollect.SiteName)));
    Navigate('Start Screen')
)
Any assistance would be appreciated.
Thank

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