in addition to .csv try .txt and .bed file (for this use an texte editor software to be sure that the file has the format, and not only the extension).
Thank you so much. I converted excel file to .txt and after i uploaded to reactome. But it couldnt find some genes. What do you think about that problem?
My data is including gene expression, like down,, up or unchanged.(250 genes) In reactome pathway browser, it analyzed my .txt data. But not all, it says 'couldnt find 77 genes'. And says 'warning'. So what can be problem? Somethings going wrong