# ATTACH Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) **Function Description:** This command is used to insert external references, raster images or underlays (DWF, DWFx, PDF or DGN files) or point clouds (RCP and RCS files) to the current drawing. **Command Access:** > **Icon:**  > **Menu:** File > Attach > **Ribbon:** Insert > Reference > Attach > **Toolbar:** Insert > Attach > **Command:** ATTACH > **Alias:** AT **Command Prompts: /** The Select Reference File dialog box is displayed.  --- **Related References：** - [Commands about Underlays (GstarCAD 2026)](../../2026/Commands/Commands%20about%20Underlays.md) **Related Tasks：** - [To Attach and Detach External Reference (GstarCAD 2026)](../../2026/Commands/To%20Attach%20and%20Detach%20External%20References.md) - [To Attach and Detach Raster Images (GstarCAD 2026)](../../2026/Commands/To%20Attach%20and%20Detach%20Raster%20Images.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/ATTACH.html) · © Gstarsoft Co., Ltd.