Problems with uploading csv files

Hi,

when i try to upload csv files to ChatGPT the upload seems to work, but the bot states he can’t find the uploaded files. When i upload them to a new chat after this, it works and ChatGPT begins seemless to work with the files. They are not as big, 60-70 lines and 12 columns. I tried also uploading them as zip file, the bot finds the zip, but fails then to extract the csv files. All other files work. Has anyone an idea?