The June Supplement consists of two PDFs uploads - Audited Financial Report and Accountant’s Letter of Qualifications.
Gain allows you to upload your PDFs into both sections. Note that PDFs can be in Letter size. June filings do not require a Jurat page.
If you have an encrypted PDF, you will need to remove the encryption. See this article for more details.
Once the PDF is attached, it will only stamp a barcode on the PDF uploads. The zip file will consist of only the PDFs you uploaded - there is no electronic data file.