Error on Android while trying to download

```
W/WM-WorkSpec(10895): Backoff delay duration less than minimum value

D/DownloadWorker(10895): DownloadWorker{url=https://docs.google.com/document/d/1IiY5PZfPQySwLnJ_gkIT2qfYuU3d_C_ZVxPtTdZgznc/export?format=pdf,filename=null,savedDir=/storage/emulated/0/Android/data/com.sensai.sevensugar.patient/files/Download,header=,isResume=false

I/flutter (10895): Background Isolate Callback: task (6972a458-226b-4d88-bc8f-05811c30ca37) is in status (DownloadTaskStatus(2)) and process (0)

D/DownloadWorker(10895): Open connection to https://docs.google.com/document/d/1IiY5PZfPQySwLnJ_gkIT2qfYuU3d_C_ZVxPtTdZgznc/export?format=pdf

I/System.out(10895): [okhttp]:check permission begin!

W/System (10895): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar

I/System.out(10895): [okhttp] e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaUtils

I/System.out(10895): [socket]:check permission begin!

W/System (10895): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar

I/System.out(10895): [socket] e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaUtils

I/System.out(10895): [OkHttp] sendRequest>>

I/System.out(10895): [OkHttp] sendRequest<<

I/flutter (10895): Background Isolate Callback: task (6972a458-226b-4d88-bc8f-05811c30ca37) is in status (DownloadTaskStatus(4)) and process (-1)

D/DownloadWorker(10895): Server replied HTTP code: 307

I/WM-WorkerWrapper(10895): Worker result SUCCESS for Work [ id=6972a458-226b-4d88-bc8f-05811c30ca37, tags={ flutter_download_task, vn.hunghd.flutterdownloader.DownloadWorker } ]

```