Retrieving a video from Documents Directory, but app cannot find location - ios

Question

I have implemented Core Data to save string formatted URLS in my application. These URLS are URLS of videos they have recorded.
I used core data because I want the video to still be available to them after they exit out of the app. I am able to save and retrieve the URLS. However, when i use them to get the video thumbnails it does not work.
Here is where I declare the video file location:
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let cropUniqueId = NSUUID().uuidString
let outputPath = "\(documentsPath)/\(cropUniqueId).mov"
Then i convert it to a string and save the data to core data:
arrayOfStringPaths.append(outputPath)
stringOfArrayPaths = stringOfArrayPaths + arrayOfStringPaths.joined(separator: ",")
saveData(arrayPath: stringOfArrayPaths)
func saveData(arrayPath: String) {
let savedVideo = VideoPath(context: context)
savedVideo.fileLocations = arrayPath
appDelegate.saveContext()
print("Saved")
}
Everything so far works fine. It saves the URLS just as they are, i checked them with various print statements.
Now I retrieve the information when the user opens the app.
var data = [VideoPath]()
func fetchSavedData() {
do {
data = try context.fetch(VideoPath.fetchRequest())
for each in data {
// I append each url to the array.
videosArray.append(URL(fileURLWithPath: each.fileLocations!))
// They all print out correctly
print(each.fileLocations!)
}
for video in videosArray {
print("This is in video array")
// This prints out correctly as the URL i recorded earlier
print(video)
// This is where everything messes up
let thumbnail = getThumbnail(video)
thumbnails.append(thumbnail)
}
} catch {
print("There was an error")
}
}
When i try to get the thumbnail of the video it gives me this error here:
"The requested URL was not found on this server." UserInfo={NSLocalizedDescription=The requested URL was not found on this server., NSUnderlyingError=0x17064c330 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}: file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-802.0.53/src/swift/stdlib/public/core/ErrorType.swift