Obsidian QuickAdd script to copy a file into a sub folder with the same name. Handly to use with folder note plugin.

move-file-to-subfolder-with-same-name.js

module.exports = async function moveFilesWithTag(params) {
    const {
        app,
        quickAddApi: { suggester, yesNoPrompt },
    } = params;

    /* ... */
    
    const { workspace, vault } = this.app;
    const activeView = workspace.getActiveFile();
    
    if (activeView) {  // The active view might not be a markdown view
        const folder = `${activeView.parent.path}/${activeView.basename}`
        const folderAbstractFile = vault.getAbstractFileByPath(folder);
        if(folderAbstractFile)
        {}
        else
        {
            await vault.createFolder(folder);
        }

        await app.fileManager.renameFile(
            activeView,
            `${folder}/${activeView.name}`
        );
    }
};