Sharing .pdf files in IOS to the Monday Mobile App

Trying to use the Share File via option on a Iphone for a .pdf file, it does not give the option to share the .pdf file to the Monday.com mobile app (also docx, xlsx does not work). It does however give the option for .png, .jpg file formats to be shared to the Monday Mobile app. Wondering if this is just a limitation on Microsoft file formats. Is this issue with Apple, Microsoft or Monday.