We have upload fields on a lot of our sites that are used for uploading spreadsheets. We don’t have any restrictions on these fields, so technically, the user can upload any default accepted file type, but the files are predominantly csv, xlsx and xls files.
A user informed us that the upload field wasn’t taking her xlsx files. She sent us the files, and I tried. It’s throwing an error… but when I resaved the files with different names, it took them.
Thoughts as to why? Corrupt files, possibly?