FCC filings for the S Pen Pro, a bigger version of the S Pen with Bluetooth, have been made public, and reveal that the upcoming stylus will support the unannounced Galaxy Z Fold 3.
Galaxy Z Fold 3 Confirmed to Support S-Pen Pro via FCC Filing
FCC filing reveals Samsung's Galaxy Z Fold 3 will support the S Pen Pro - Talk Android
S Pen Fold Edition vs. S Pen Pro: What's the difference?
Samsung Galaxy Z Fold 3 will support S Pen Pro, FCC reveals
Samsung Galaxy Z Fold 3: Should you get S Pen Fold Edition or S Pen Pro?
F-TECH Fold 3 S Pen Fold Edition Stylus Pen 4096 Pressure Replacement for Samsung Galaxy Z Fold 3 5G Touch Screen Stylus S Pen with Tips (Black) : Cell Phones & Accessories
Galaxy Z Fold 3 Gets Major Approval, Feature Confirmation
The Galaxy Z Fold 3 will support the S Pen Pro, according to FCC filings - The Verge
Samsung S Pen Pro vs S Pen Fold Edition: What's the difference?
S Pen Fold Edition vs. S Pen Pro: What's the difference?
Galaxy Z Fold 3 Confirmed to Support S-Pen Pro via FCC Filing