photoFiles = new ArrayList<File>();
        MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
        int index = 0;
        for(Bitmap bitmap: previewBitmaps)
        {
            File file = null;
            try{
                String fileName = String.valueOf(System.currentTimeMillis())+".jpeg";
                file = new File(Environment.getExternalStorageDirectory(), fileName); // create temporary file start from here
                if(file.exists())
                {
                    file.delete();
                }
                OutputStream os = new BufferedOutputStream(new FileOutputStream(file));
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
                os.close();

                photoFiles.add(file);
                requestBodyBuilder.addFormDataPart("files",file.getName(), RequestBody.create(MediaType.parse("image/png"),file));
            }
            catch (Exception e)
            {
                Toast.makeText(getBaseContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
            }
            index++;
        }
//Upload process goes here and delete files back after upload

photoFiles = new ArrayList<File>();
        MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
        int index = 0;
        for(Bitmap bitmap: previewBitmaps)
        {
            File file = null;
            try{

                Uri uri = Uri.parse(photosUriStrings.get(index));
                file = new File(getPathFromUri(uri));
                Toast.makeText(getBaseContext(),getPathFromUri(uri),Toast.LENGTH_SHORT).show();
                photoFiles.add(file);
                requestBodyBuilder.addFormDataPart("files",file.getName(), RequestBody.create(MediaType.parse("image/png"),file));
            }
            catch (Exception e)
            {
                Toast.makeText(getBaseContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
            }
            index++;
        }

Picasso.with(getContext()).load("URI path").into(holder.imgID);