Windows 10: Transferring photos from phone to laptop causes HUGE file sizes

This post contains both the problem AND the solution. I'm re-stating the problem because all of the numerous previous posts of the problem have been locked.THE PROBLEM:- You transfer photos from your phone to your laptop and discover that the photos in the destination laptop have HUGE file sizes and cannot be opened.THE SOLUTION:What you CAN and CANNOT DO: You CANNOT: - MOVE a folder of photos/videos from your phone to your laptop. Don't know why this is a problem, but it must be avoided. Folders containing NON-photos/videos files don't seem to have this problem though. You CAN: - COPY a fol

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Image size huge after transfer from phone to computer

Images taken on an iphone (iPhone 7, up to date) seem to store with normal file size (several MB). When connecting the phone through USB cable to a windows computer, some of the copied files/images have a giant file size. The lowest value is about 600MB, but some images can "grow" to 2 or even 3 GB.
When replicating the copy action, the same files are stored as it should (with their sizes like on the phone, being about 3-4 MB).

Looking back, it seems this has always been the issue since the phone was purchased (about 1 and a half year ago).

EDiT
It's a simple file transfer through explorer.
I've compared a normal images and a corrupted image properties, and nothing out of the ordinary except file size.
Read only attribute is not checked.
File size is checked through explorer on the phone (didn't found a way to do so on the phone).

Any suggestions what could cause this behavior?
Let me know if I can provide extra information.

 

can't transfer files between laptop and phone over BT

To transfer files from the phone to the laptop you must first set up the laptop so it is waiting to receive files. In Settings > Devices > Bluetooth & other devices:

1. Turn on Bluetooth
2. Click on 'Send or receive files via Bluetooth'
3. Click 'Receive files'

When you send a file to the laptop it then ask you to choose where to save it.





As it happens, these screenshots were from my old Toshiba L750 *Wink

 

Image size huge after transfer from phone to computer

Before figuring out the exact cause, you need to know the actual amount of data transferred. It could be that the software interface between your PC and your iPhone are just showing miscalculated values. Try the following two methods:

1. set up a tiny file server on your PC, e.g. FileZilla FTP server, or HFS (a very simple http file server), and use FTP clients or web browsers on your phone to upload images to them, watch for the file size.
   
2. use resmon.exe (System Resource Monitor), or some third-party hacker tools like ProcessExplorer from SysInternals or ProcessHacker by Wen Jia Liu, and monitor system I/O delta size. The graphic curves automatically provided by these tools shall suffice.
   

In case you do find bulky uploads, you can keep the large files got in method 1 temporarily, and run binary file editors / hex-editors like UltraEdit, HxD on both the erroneous files and the correct files to see what extra data has been actually written to these bulky files.