Users now have the ability to bulk upload a set of collection seeds when creating a new collection!
Upon upload the file is checked for the appropriate file type (text/csv) and is parsed for entities. The file format should be a CSV of two columns: TYPE, NAME. Valid types are available at the link below, and at time of writing include: Domain, NetBlock, EmailAddress, DnsRecord, IpAddress and GithubAccount. Note that capitalization matters for these types.
See the "Creating a New Collection" documentation for more details!