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ArcGISAttachment Connector - Multiple Attachments

  • Dec 31, 2025 11:54 PM UTC
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caroline_salem
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Hello, 

I am struggling with using the ArcGIS Attachment Connector to upload multiple attachments in an ArcGIS Online Feature Service

I am able to add one attachment but for some reason it will not add multiple photos. 

This is for a Survey123 that I set up an automation in FME Flow with webhook to add certain features to a hosted feature layer in ArcGIS Online. It runs fine, adds the data, but the moment there is more than 1 photo that needs to be attached, it only uploads 1 photo. Any advice would be greatly appreciated. Thank you!

Edit: This works perfectly fine on the workbench (it will add all attachments) but when I try to run it on flow, it will only add 1 attachment. 

I do receive the following error message: 
 

158 2026-1-2 10:50:31 | Message Type: fme::internal::_v0::py::Exception
159 2026-1-2 10:50:31 | Python Exception <TypeError>: Unknown output tag 'Output' passed into pyoutput()
160 2026-1-2 10:50:31 | Error encountered while calling method `input'
161 2026-1-2 10:50:31 | ArcGISAttachmentConnector (PythonFactory): PythonFactory failed to process feature
162 2026-1-2 10:50:31 | An error has occurred. Check the logfile above for details

Best answer by caroline_salem

I solved it. I needed to connect some sort of output to the ArcGISAttachmentConnector. So I connected the HTML Report Generator to generate a quick html of how manay attachments should be there. 

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    caroline_salem
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    • caroline_salemContributor
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    • Best Answer
    • Jan 2, 2026 7:39 PM UTC

    I solved it. I needed to connect some sort of output to the ArcGISAttachmentConnector. So I connected the HTML Report Generator to generate a quick html of how manay attachments should be there. 

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