Why did not save multiple images with controller route return?

In my Laravel app I have form to save multiple images to save uploads table, my form as following,

<form method="post" action="" enctype="multipart/form-data"> 
            
<div class="form-group row required">
            <div class="field" align="left" >
            <h3>Upload  images</h3>
            <input type="file" class="files" name="files[]" multiple />
            <input type="file" class="files" name="files[]" multiple />
            <input type="file" class="files" name="files[]" multiple />
            <input type="file" class="files" name="files[]" multiple />
            </div>
</div>

and controller store function is,

$photos = $request->file('files');

        if (!is_array($photos)) {
            $photos = [$photos];
        }

        if (!is_dir($this->photos_path)) {
            mkdir($this->photos_path, 0777);
        }

        for ($i = 0; $i < count($photos); $i++) {
            $photo = $photos[$i];
            $name = sha1(date('YmdHis') . str_random(30));
            $save_name = $name . '.' . $photo->getClientOriginalExtension();
            $resize_name = $name . str_random(2) . '.' . $photo->getClientOriginalExtension();

            Image::make($photo)
                ->resize(250, null, function ($constraints) {
                    $constraints->aspectRatio();
                })
                ->save($this->photos_path . '/' . $resize_name);

            $photo->move($this->photos_path, $save_name);

            $upload = new Upload();
            $upload->filename = $save_name;
            $upload->resized_name = $resize_name;
            $upload->original_name = basename($photo->getClientOriginalName());
            $upload->vehicle_id = $vehicle->id;
            $upload->save();
            return redirect()->route('categories.categorypost')->with('info','Your Advertisment has been created successfully');
        }
    }

but when I attach 4 images in above form. it is saving only one image. that attach to first input file. why other images are not saving to table. but when i remove return following codes

return redirect()->route('categories.categorypost')->with('info','Your Advertisment has been created successfully');

then I can save all images. but I need above controller return and saving all images. how can I do this?

via Chebli Mohamed