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Please check your default location or change it please.
In the menu bar, click the Apple icon .
Click System Preferences.
Click Print & Scan, or Printers & Scanners.
Click the name of your printer, and then click Open Print Queue.
Click Printer Setup or Settings, click Utility, and then click Open Printer Utility.
Under Scan Settings, click Scan to Computer.
Select the Scan Tasks button, select the task you want to modify, and then click Edit Scan Task.
In the Preferences screen, adjust the required target folder on the Scan to line, and then click Save.