The situation: my website generate pdf form html using html2pdf JavaScript and try below solution in
It successfully start downloading without crashing but the pdf file downloads is unsuccessful.

the kotlin code:

private fun download(
    url: String,
    userAgent: String,
    contentDisposition: String,
    mimeType: String,
    contentLength: Long
) {
    val folder = File(Environment.getExternalStorageDirectory().toString() + "/Download/Image")
    if (!folder.exists()) {
        folder.mkdirs()
    }
    Toast.makeText(this, "Download Started", Toast.LENGTH_SHORT).show()

    // Remove the 'blob:' prefix if it exists
    val cleanUrl = url.replace("blob:", "")

    val request = DownloadManager.Request(Uri.parse(cleanUrl))
    request.setMimeType(mimeType)
    val cookie = CookieManager.getInstance().getCookie(cleanUrl)
    request.addRequestHeader("cookie", cookie)
    request.addRequestHeader("User-Agent", userAgent)
    request.setAllowedNetworkTypes(
        DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE
    )
    val fileName = URLUtil.guessFileName(cleanUrl, contentDisposition, mimeType)
    request.setTitle(fileName)
    request.setNotificationVisibility(
        DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
    )
    request.setDestinationInExternalPublicDir(
        Environment.DIRECTORY_DOWNLOADS,
        "Image/$fileName"
    )
    val downloadManager = getSystemService(DOWNLOAD_SERVICE) as DownloadManager
    downloadManager.enqueue(request)
}

I tried the recommendation about try in real device however the result is the same. Please help 🙂

the logcat:

2024-06-03 23:13:39.866  7633-7652  EGL_emulation           com.coding.meet.webviewtoapp         D  app_time_stats: avg=5244564.50ms min=5244564.50ms max=5244564.50ms count=1
2024-06-03 23:13:40.542  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 0ms Starting document clone", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:40.883  7633-7652  EGL_emulation           com.coding.meet.webviewtoapp         D  app_time_stats: avg=58.57ms min=8.43ms max=488.87ms count=16
2024-06-03 23:13:40.948  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd6a 0ms Starting document clone", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:41.470  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 931ms Document cloned, using computed rendering", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:41.470  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 931ms Starting DOM parsing", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:41.603  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 1066ms Added image https://smartappx.site/assets/malaysia.png", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:41.644  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 1107ms Added image https://smartappx.site/assets/jps-logo.png", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:42.332  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 1794ms Starting renderer", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:42.337  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 1796ms Canvas renderer initialized (634x1373 at 0,0) with scale 2", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:42.627  7633-7633  chromium                com.coding.meet.webviewtoapp         I  [INFO:CONSOLE(2)] "18fdea9cd86 2074ms Finished rendering", source: https://smartappx.site/js/html2pdf.bundle.min.js (2)
2024-06-03 23:13:43.182  7633-7633  Url                     com.coding.meet.webviewtoapp         D  blob:https://smartappx.site/547b98d3-ba77-4c79-a315-35e020c5d34e
2024-06-03 23:13:43.183  7633-7633  userAgent               com.coding.meet.webviewtoapp         D  Mozilla/5.0 (Linux; Android 12; sdk_gphone64_x86_64 Build/SE1A.211212.001.B1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.114 Mobile Safari/537.36
2024-06-03 23:13:43.183  7633-7633  contentDisposition      com.coding.meet.webviewtoapp         D  
2024-06-03 23:13:43.183  7633-7633  mimeType                com.coding.meet.webviewtoapp         D  application/pdf
2024-06-03 23:13:43.188  7633-7633  contentLength           com.coding.meet.webviewtoapp         D  561986
2024-06-03 23:13:43.271   611-2517  Compatibil...geReporter system_server                        D  Compat change id reported: 135634846; UID 10064; state: DISABLED
2024-06-03 23:13:43.272   611-2517  Compatibil...geReporter system_server                        D  Compat change id reported: 177438394; UID 10064; state: DISABLED
2024-06-03 23:13:43.273   611-2517  Compatibil...geReporter system_server                        D  Compat change id reported: 135772972; UID 10064; state: DISABLED