# ATTACH Command [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [Commands](Help%20System/GSTARCAD/2018/Commands/(Commands).md) → [A](Help%20System/GSTARCAD/2018/Commands/A/(A).md) The ATTACH command is used to insert external reference, raster image or underlay (DWF, DWFx, PDF or DGN file) to current drawing. ## Command Access: > **Ribbon:** Insert \> Reference \> Attach > **Command:** ATTACH ## Function Description: In the "Select Reference File" dialog box, users could select one file to attach in current drawing. ## Other versions with matching text [GstarCAD 2016](../../../2016/Commands/A/ATTACH%20Command.md) · [GstarCAD 2017](../../../2017/Commands/A/ATTACH%20Command.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/Commands/A/ATTACH%20Command.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/Commands/A/ATTACH%20Command.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/Commands/A/ATTACH%20Command.md)