Q: Are there any limits on the size of a file we can upload to a project or task or custom form?
A: The limit size will always be guided by your isp and a good connection but beyond that there are some limits set by EP, as follows:
Project or tasks: up to 2 Gb should be fine - the only restriction is attachment content search will skip documents larger than 128Mb - they will be searchable by filename, but not by file content
Custom form uploads: 30 Mb