The size limit per file is 500MB.
There is no limit on the number of files or the total size of all files in an object.
The following file extensions are allowed:
".7z",".bmp",".csv",".docm",".docx", ".jpeg",".jpg",".msg",".ods",".odt",".pdf",".png",".ppt",".pptx,".rar", ".rtf",".tif",".tiff",".txt",".xlsb",".xlsm",".xlsx",".zip",".gif"
IMPORTANT INFORMATION as of May 2024 :
Compression formats will be removed from the whitelist and will not be allowed as attachments anymore. This includes formats such as .zip, .z01, .z02, .7zip, .rar, .tar, .gz …
GIS file formats, as well as the following formats, are added to the whitelist and will be allowed: .asice, .adoc, .bdoc, .cdoc, .ddoc, .edoc.