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Upload/Save image not use entity form to CDS

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I'm trying add attchment image using html+javascript in portal, then will saving to entity with field Image created before.

But when i save it, have message error:

"Common Data Service ","cdscode":"0x0","innererror":{"code":"0x0","message":"An error occurred while validating input parameters: Microsoft.OData.ODataException: Cannot convert the literal 'C:\\fakepath\\62540459_1076021599262001_7342501863893237760_n.jpg' to the expected type 'Edm.Binary'

So, how to save image to CDS without entity form?

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Power Apps portals

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OOlashyn 3,496 Most Valuable Professional on at

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Hi @Anonymous,

File and Image fields are not supported in the Power Apps Portals. The only way to add attachments is either via timeline or via add file functionality. You might try to use Web API, but I don't know if it will work with file and image fields (and also it is in preview).

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Fubar 8,354 Super User 2025 Season 2 on at

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as per OOlashyn - however, one possible (advanced) way may be to use OAuth 2.0 implicit grant flow where you send your payload ('securely' using an Ajax call) from a Power Apps Portal Web Page to Azure and then write your data from Azure to CRM/CDS/Dataverse see https://docs.microsoft.com/en-us/powerapps/maker/portals/oauth-implicit-grant-flow (at the bottom of the page there is also a link where there is some sample code)

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