File Name extension got changed while multiple download

[rajarathinam-MurugesaPandiyan]

I Have used Flutter downloader for downloading , I'm facing a issue in andriod , After downloading the same file the file name should be one.png to one(1).png , but the file saved as one.png(1) , so the device finds that this is a unsupported format and the duplicate is not shown in the gallery

I have attached the screenshots below

[balajiks-dev]

@rajarathinam-MurugesaPandiyan Please attach the code to find it more accessible.