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Within the Interface Designer, when uploading a document to a File Upload field and selecting "Submit", the following error is displayed:
Could not display interface. Please check definition and inputs.
Interface Definition: Expression evaluation error at function a!fileUploadField [line X]: Error in a!forEach() expression during iteration 1: Expression evaluation error at function fn!content_appian_internal [line X]: Invalid Content ID
However, when navigating to the document folder, users see that the document uploaded correctly.
This is an expected error in the Interface Designer. When a document is submitted, the ID changes upon submission and the previous ID gets deleted. In the Interface Designer, the user stays in the same location after submission, causing the error about the invalid ID.
This is not an issue in Appian 17.4.
This article applies to Appian 17.3 and below.
Last Reviewed: November 2017