iOS: Terminated due to memory issue

After uploading one or multiple files the app crashes due to a memory issue. This happens at around 1:30 min. after the upload is started/finished (not sure).

The only log I get is: **Message from debugger: Terminated due to memory issue**

On my iPad it is reproducible 100% of the time.

Commit: dbdc47d33905cc05ae939ab2d5bec2e678923703

My three plist keys are:
FUMaximumConnectionsPerHost: 1
FUMaximumUploadOperation: 1
FUTimeoutInSeconds: 3600

My call:
```
taskId = await FlutterUploader().enqueue(
url: url,
files: [FileItem(path: file.path)],
method: UploadMethod.POST,
data: data,
headers: headers,
);
```

Device Info:
- OS Version: iPhone OS 13.5 (Build 17G68)
- Hardware model: iPad7,5