[Bug] Dropbox not working when you select data from storage

I'd set my dropbox to get a big csv from a storage, and the web freezes and it turns completed white and can't get the data from dropbox.

Thanks

Start by reproducing the failure in the web app: select a large CSV from Dropbox storage and observe the freeze, white screen, and missing data. Trace the Dropbox selection and data-loading path from that interaction, then verify that the CSV loads successfully without freezing or leaving the page blank.

Written by the indexing model from the issue text.