我有一个“添加照片”按钮，使用ng-file-upload上传图像但在上传后我创建了一种方法，可以更改图像的亮度并将图像保存在dataUrl中。现在，问题是覆盖上传文件夹中已存在的图像。如何覆盖它？
Persons (SSN, Name, HouseId, ApartmentNumber, Salary)
Houses (HouseID, HouseAddress, ApartmentCount, Color)
Landlords (LandlordID, OwnerSSN, LandlordAddress)
Ownerships (LandlordID, HouseID, PurchaseDate, PropertyTax)
Tenants (HouseID, ApartmentNumber, LeaseTenantSSN, LeaseStartDate, LeaseExpirationDate,
Rent, LastRentPaidDate, RentOverdue)