From the Securities and Exchange Commission:
Effective June 9, 2021, EDGARLink Online permits filers to attach multiple documents simultaneously to EDGAR submissions, if the filer is using an internet browser other than Internet Explorer.
If the filer is using Internet Explorer, the filer must attach documents one at a time to EDGAR submissions.
For questions or further information, please contact Filer Support—Monday through Friday (except federal holidays), 9:00 a.m. to 5:30 p.m. ET, (202) 551-8900, option 3.
Find out more:
SEC.gov | EDGARLink Online Document Attachment Capabilities (https://www.sec.gov/oit/announcement/document-attachment-capabilities)