Pipelines with a schema can implement restrictions on the format of an input file; for example, they might restrict filenames to not contain spaces and be in csv format.

Currently, when a file is uploaded as a dataset and then browsed within the Launchform, but does not adhere to the schema validation, it is greyed out. A blue box is shown with a hint such as

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For users unfamiliar with regex's this is hard to parse and act on. Having a more intuitive message would improve the experience for non-computational users.