You will need a browser on your computer / smartphone / tablet PC. The same applies for everyone who would upload files using the upload page.
For Email upload a dektop- or web-client for emails.
You may also use CloudWok with any mobile device. We keep improving the mobile access of our site in various direction.
For some really old browsers there may be some restrictions - also for general internet security reasons we recommend an upgrade. We know that especially for your workplace you may not be authorized to upgrade any software, but we are quite sure this only to be the case for very few people.
That’s about it.