Local data preventing application from loading on shinyapps.io

Is your data file in the same folder as your app.R file? are you using a relative path to your data file? (e.g. ~/data.csv)

It's hard to help you any further without seen any code, could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.