In some recent projects, I have had the challenge of uploading data that the client previously had.
The alternative of using CVS has restrictions and limits the quality of the data to upload.
The free alternative I found was to use https://sheety.co
With this tool you can convert a Google Sheet into an API, with the paid version you have the option of PUT, DELETE, etc., but for my needs, the REQUEST is enough for me.
This way I was able to upload 2000+ rows of data without losing integrity and the best part is that I can continue using Google Sheets as a live data source, whether that data is entered via form or manually in the sheet.
Every day I am more convinced of the possibilities that Bubble has, with little help like this, I think we are even more efficient.
Feel free to contact me if you need help with your development or idea.