shiny upload file example: "Error: an error had occured. Check your logs or contact the app author for clarification"

Hi there, and welcome to! It's a little hard to help with only a screenshot to go on and no code. To help you get the right help for your question, can you please turn it into a reprex (reproducible example)? This will ensure we're all looking at the same data and code. A guide for debugging Shiny apps and creating a Shiny reprex can be found here.

I will echo what @ksavin has said about checking the logs - the user-facing error messages are pretty generic.

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