File > Save As does not work on non-Chromium browsers.

	async function saveFile(blob, filename, reject) {
	if (!isElectron() && !isMobile) { // to show a file dialog in Chrome
	try {
	const fileHandle = await self.showSaveFilePicker({
	suggestedName: filename,
	types: [ { description: "File" } ]
	});
	const writeFile = async (fileHandle, contents) => {
	const writable = await fileHandle.createWritable();
	await writable.write(contents);
	await writable.close();
	};
	writeFile(fileHandle, blob).then(() => {
	//
	});
	} catch (err) {
	// canceled
	}
	} else { // showSaveFilePicker browser compatibility
	reject();
	}
	}

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