"the “seven lamps of fire” and the “golden altar” represented by the golden candlestick and the altar of incense in the sanctuary on earth. Again, “the temple of God was opened” ( Revelation 11:19 ), and he looked within the inner veil, upon the holy of holies. Here he beheld “the ark of His testament” ( Revelation 11:19 ), represented by the sacred chest constructed by Moses to contain the law of God. PP 356.1"
"And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail."
EGW directly quotes and interprets Revelation 11:19, making a clear connection between the heavenly temple and the earthly sanctuary.