diff --git a/dropbox/dropbox.go b/dropbox/dropbox.go
index a2fdb61ef..4e0ae5091 100644
--- a/dropbox/dropbox.go
+++ b/dropbox/dropbox.go
@@ -813,8 +813,7 @@ func (o *Object) uploadChunked(in0 io.Reader, commitInfo *files.CommitInfo, size
 	if size != -1 {
 		chunks = int(size/chunkSize) + 1
 	}
-	wc := &writeCounter{}
-	in := io.TeeReader(in0, wc)
+	in := fs.NewCountingReader(in0)
 
 	fmtChunk := func(cur int, last bool) {
 		if chunks == 0 && last {
@@ -853,12 +852,12 @@ func (o *Object) uploadChunked(in0 io.Reader, commitInfo *files.CommitInfo, size
 			// if the size is known, only upload full chunks. Remaining bytes are uploaded with
 			// the UploadSessionFinish request.
 			break
-		} else if chunks == 0 && wc.Written-cursor.Offset < uint64(chunkSize) {
+		} else if chunks == 0 && in.BytesRead()-cursor.Offset < uint64(chunkSize) {
 			// if the size is unknown, upload as long as we can read full chunks from the reader.
 			// The UploadSessionFinish request will not contain any payload.
 			break
 		}
-		cursor.Offset = wc.Written
+		cursor.Offset = in.BytesRead()
 		fmtChunk(currentChunk, false)
 		err = o.fs.pacer.CallNoRetry(func() (bool, error) {
 			err = o.fs.srv.UploadSessionAppendV2(&appendArg, &io.LimitedReader{R: in, N: chunkSize})
@@ -871,7 +870,7 @@ func (o *Object) uploadChunked(in0 io.Reader, commitInfo *files.CommitInfo, size
 	}
 
 	// write the remains
-	cursor.Offset = wc.Written
+	cursor.Offset = in.BytesRead()
 	args := &files.UploadSessionFinishArg{
 		Cursor: &cursor,
 		Commit: commitInfo,
@@ -929,17 +928,6 @@ func (o *Object) Remove() (err error) {
 	return err
 }
 
-type writeCounter struct {
-	Written uint64
-}
-
-// Write implements the io.Writer interface.
-func (wc *writeCounter) Write(p []byte) (int, error) {
-	n := len(p)
-	wc.Written += uint64(n)
-	return n, nil
-}
-
 // Check the interfaces are satisfied
 var (
 	_ fs.Fs          = (*Fs)(nil)
diff --git a/fs/counting_reader.go b/fs/counting_reader.go
new file mode 100644
index 000000000..20629dad3
--- /dev/null
+++ b/fs/counting_reader.go
@@ -0,0 +1,28 @@
+package fs
+
+import "io"
+
+// NewCountingReader returns a CountingReader, which will read from the given
+// reader while keeping track of how many bytes were read.
+func NewCountingReader(in io.Reader) *CountingReader {
+	return &CountingReader{in: in}
+}
+
+// CountingReader holds a reader and a read count of how many bytes were read
+// so far.
+type CountingReader struct {
+	in   io.Reader
+	read uint64
+}
+
+// Read reads from the underlying reader.
+func (cr *CountingReader) Read(b []byte) (int, error) {
+	n, err := cr.in.Read(b)
+	cr.read += uint64(n)
+	return n, err
+}
+
+// BytesRead returns how many bytes were read from the underlying reader so far.
+func (cr *CountingReader) BytesRead() uint64 {
+	return cr.read
+}
diff --git a/yandex/yandex.go b/yandex/yandex.go
index 5a08ae2ea..1cea449ce 100644
--- a/yandex/yandex.go
+++ b/yandex/yandex.go
@@ -421,6 +421,11 @@ func (f *Fs) Put(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.
 	return o, o.Update(in, src, options...)
 }
 
+// PutStream uploads to the remote path with the modTime given of indeterminate size
+func (f *Fs) PutStream(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) {
+	return f.Put(in, src, options...)
+}
+
 // Mkdir creates the container if it doesn't exist
 func (f *Fs) Mkdir(dir string) error {
 	root := f.diskRoot
@@ -565,8 +570,8 @@ func (o *Object) remotePath() string {
 // Copy the reader into the object updating modTime and size
 //
 // The new object may have been created if an error is returned
-func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) error {
-	size := src.Size()
+func (o *Object) Update(in0 io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) error {
+	in := fs.NewCountingReader(in0)
 	modTime := src.ModTime()
 
 	remote := o.remotePath()
@@ -581,7 +586,7 @@ func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOptio
 	err := o.fs.yd.Upload(in, remote, overwrite, mimeType)
 	if err == nil {
 		//if file uploaded sucessfully then return metadata
-		o.bytes = uint64(size)
+		o.bytes = in.BytesRead()
 		o.modTime = modTime
 		o.md5sum = "" // according to unit tests after put the md5 is empty.
 		//and set modTime of uploaded file
@@ -648,9 +653,10 @@ func (o *Object) MimeType() string {
 
 // Check the interfaces are satisfied
 var (
-	_ fs.Fs      = (*Fs)(nil)
-	_ fs.Purger  = (*Fs)(nil)
-	_ fs.ListRer = (*Fs)(nil)
+	_ fs.Fs          = (*Fs)(nil)
+	_ fs.Purger      = (*Fs)(nil)
+	_ fs.PutStreamer = (*Fs)(nil)
+	_ fs.ListRer     = (*Fs)(nil)
 	//_ fs.Copier = (*Fs)(nil)
 	_ fs.ListRer   = (*Fs)(nil)
 	_ fs.Object    = (*Object)(nil)