Patch Sharepoint list when a gallery item is marked does not work

[JensVolswinkler]

I have a gallery with checkboxes. The gallery uses data from sharepoint.

If a checkbox is marked and I click on a button the marked items in sharepoint shall be patched (column "Send" shall be set to "true").

I tried the following code, but the sharepoint list is not patched.

ForAll(Filter(Gallery.AllItems; CheckboxAuswählen.Value = true); Collect(MarkedItems; {string:Titel});;
Patch(SharepointList; LookUp(SharepointList; Titel= First(MarkedItems).string); {Send: true});;
Remove(MarkedItems;First(test)));;

Thanks a lot!

[RezaDorrani]

Hi @JensVolswinkler 

Check https://youtu.be/VzrarcM9W5k

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Thanks,
Reza Dorrani, MVP
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[JensVolswinkler]

Hi @RezaDorrani I watched some parts of your videos, but I am not sure if they can help me in this concrete case...will probably have to watch them in full.

I replaced "Titel= First(MarkedItems).string" with "Titel = ExistingTitle" and the sharepoint entry with the existing title got patched....

therefore I assume that "Titel= First(MarkedItems).string" is not working as expected.

Why is that the case? 

Why is that the case?

[JensVolswinkler]

I can stil not figure it out...the video has a lots of interesting informations @RezaDorrani but I do not see how it helps me solve my problem.

Could you please tell me in which part of the video you think is the solution - 

or directly explain to me how I can solve this.

Thanks a lot in advance!

[KvB1 · Accepted solution]

If the items property of your gallery directly has your sharepoint list as a source, you can just use "ThisRecord" Instead of the lookUp

Something like: 

ForAll(
       Filter(
              Gallery.AllItems;
              CheckboxAuswählen.Value=true
              );
       Patch(
             SharePointList;
             ThisRecord;
             {
              Send: true
             }
       )
)

Please check syntax i freehanded