diff --git a/chromecast/crash/cast_crashdump_uploader.cc b/chromecast/crash/cast_crashdump_uploader.cc
index d9a55440cd1fa6..3a278f8c51594b 100644
--- a/chromecast/crash/cast_crashdump_uploader.cc
+++ b/chromecast/crash/cast_crashdump_uploader.cc
@@ -6,6 +6,8 @@
 
 #include <sys/stat.h>
 
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/logging.h"
 // TODO(slan): Find a replacement for LibcurlWrapper in Chromium to remove the
 // breakpad dependency.
@@ -51,6 +53,12 @@ CastCrashdumpUploader::~CastCrashdumpUploader() {
 
 bool CastCrashdumpUploader::AddAttachment(const std::string& label,
                                           const std::string& filename) {
+  int64_t file_size = 0;
+  if (!base::GetFileSize(base::FilePath(filename), &file_size)) {
+    LOG(WARNING) << "file size of " << filename << " not readable";
+    return false;
+  }
+  LOG(INFO) << "file size of " << filename << ": " << file_size;
   attachments_[label] = filename;
   return true;
 }
diff --git a/chromecast/crash/cast_crashdump_uploader_unittest.cc b/chromecast/crash/cast_crashdump_uploader_unittest.cc
index a2593b760389c0..941cce26bab36c 100644
--- a/chromecast/crash/cast_crashdump_uploader_unittest.cc
+++ b/chromecast/crash/cast_crashdump_uploader_unittest.cc
@@ -138,9 +138,6 @@ TEST(CastCrashdumpUploaderTest, UploadFailsWithInvalidAttachment) {
   // Create a temporary file.
   ScopedTempFile minidump;
 
-  EXPECT_CALL(*m, Init()).Times(1).WillOnce(Return(true));
-  EXPECT_CALL(*m, AddFile(minidump.path().value(), _)).WillOnce(Return(true));
-
   CastCrashdumpData data;
   data.product = "foobar";
   data.version = "1.0";
@@ -152,8 +149,7 @@ TEST(CastCrashdumpUploaderTest, UploadFailsWithInvalidAttachment) {
   CastCrashdumpUploader uploader(data, std::move(m));
 
   // Add a file that does not exist as an attachment.
-  uploader.AddAttachment("label", "/path/does/not/exist");
-  ASSERT_FALSE(uploader.Upload(nullptr));
+  ASSERT_FALSE(uploader.AddAttachment("label", "/path/does/not/exist"));
 }
 
 TEST(CastCrashdumpUploaderTest, UploadSucceedsWithValidAttachment) {