Thank you for providing all the details. We will get back to you very soon.
Currently, I identify this problem with datapoint by give the validation status “on hold” for the unable retrieved attached documents.
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Hi @chamnabchhoeung, please note that this is related to a known issue in the UI submission modal and does not reflect missing attachment data for your project 
To access the attachment outside of the modal, you can refer to the support article here: Downloading Photos and Other Media — KoBoToolbox documentation
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