Files and explorer

The Project explorer lists project files. Select a file to open it; unopened account files load when needed. Expanding/collapsing a directory only changes the explorer view.

Add controls

Control	Availability	Action and result
Add to Java project	Editable Java project	Opens source creation and general file actions.
Add to a source folder / package	Editable Java source set	Creates in that source root/package. Test roots stay separate from production.
Class	Java add menu	Creates a class.
Interface	Java add menu	Creates an interface.
Enum	Java add menu	Creates an enum.
Record	Supported Java version	Creates a record declaration.
Annotation	Java add menu	Creates an annotation declaration.
Package / Subpackage	Java source root / package	Creates a namespace beneath the configured root.
File	Editable project	Opens Create a file. Enter Filename, then Create file. Invalid or duplicate names are rejected.
Folder	Editable project	Opens Create a folder. Enter Folder path, then Create folder. This does not declare a Java package.
Upload file	Editable project	Imports into the selected directory. Accepted extensions depend on project type; failures appear in the explorer.
Add resource to a resource folder	Java resource root	Adds a supported text resource.
Add Java dependency	Saved editable Java project	Uploads/attaches a dependency archive, separately from source uploads.
Expand / Collapse dependencies	Java	Shows/hides attached dependency rows.

Java text uploads include .java, .md, .txt, .properties, .json, .xml, .csv, .html, .yaml and .yml. Arduino/ESP-IDF have different validators. The chooser’s extension list does not guarantee that every destination path is valid.

File and folder actions

Use Actions for [path] or the context menu. Read-only workspaces hide editing actions.

Control	Action and conditions
Open to side	Opens the file in another editor group.
Rename / move…	Changes its project-relative path after validation. Review Java packages/references after moving sources.
Refactor references	Opens the microcontroller reference refactoring flow separately from renaming.
Download file	Downloads this file; independent of paid whole-project export.
Delete file	Removes a file through the deletion flow. Disabled for the Arduino entry sketch or last remaining file.
Delete folder	Deletes the directory and nested files after confirmation. Source roots/protected files cannot be deleted.
Close editor tab	Keeps edits and closes the view; does not delete the file.
Create Test…	Creates a package-mirrored Java test skeleton or opens the existing test.
Run Tests in File	Runs tests for that Java file when testing is available.
Go to Test / Tested Class	Navigates using package/filename conventions; offers a chooser for multiple matches.

There is no general Duplicate file entry here. Create a separate supported file and copy contents if needed.

Arduino libraries and data

New Arduino library creates editable source and library.properties. Upload Arduino library ZIP validates/expands a standard archive under libraries/. Import Arduino library from Git URL previews the library and dependencies before a revision-checked install. Inspect source/version/examples before updating. Remove library [name] removes project-local libraries; built-in libraries have no removal action.

A Board mismatch warning reports declared architecture compatibility; compilation still determines whether it builds. Libraries remain when changing boards. ESP32 Arduino data/ assets support LittleFS/SPIFFS physical filesystem images. UNO retains these files but labels them unused. Binary data assets can be downloaded; they are not source text.