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Microsoft Dynamics 365 | Integration, Dataverse...
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Powerapps Lookup and Thumbnail problem

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Hi! 
A few months ago my App was working without issues, I uploaded and change a table each time. No problem. 
Starting this year I did a change. Now, I cannot see the images, pictures that are associated to a question. 
 
My App is a "TEST" App, where I have a table with questions, possible answers and correct answer.
Sometimes the question is "which is the name of this product?" and a picture of a product appears. 
- The question's table is in EXCEL
- The images are in SharePoint
 
In Sharepoint all the images have the ID column. 
In Excel I added an "ID_image" column where I use the sharepoint ID that I need. 
So, I connect them. 
 
Now, separately, it works! 
 
I can see the image if I do this:
 
LookUp(Documents,ID=53). Thumbnail.Large
 
I can see the correct ID number if I do this:
LookUp(Questions,QID=varNum,'ID_Product ')
The answer to this formula is 53
 
However, If I match them on an image icon:
LookUp(Documents,ID=LookUp(Questions,QID=varNum,'ID_Product ')). Thumbnail.Large
This doesn't work!
 
Any idea why? 
I get the yellow triangle saying that "incompatible types for comparison". 
 
It should easy to solve, it worked before, but it isn't working now. 
 
Thank you!
 
 
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