Laravel | File upload. Problem with saving into database

Hello guys, I am trying to upload file, and save into DB (in table documents)

Model Document:

class Document extends Model
{
    protected $fillable = [
        'filename',
        'subpage_id',
    ];
    protected $appends = ['path'];

    public function getPathAttribute()
    {
        return asset('caritas/storage/app/'.$this->filename);
    }

    public $timestamps = false;

    public function subpage()
    {
        return $this->belongsTo(Subpage::class, 'subpage_id');
    }
}

ForeignKey:

Schema::table('documents', function(Blueprint $table){
            $table->integer('subpage_id')->unsigned()->change();
            $table->foreign('subpage_id','documents_subpage_id_foreign')->references('id')->on('subpages');
});

Function Store in SubpageController:

 public function store(Request $request)
    {
        $subpage = Subpage::create($request->all());
      
        if ($request->has('documents')){
            foreach ($request->documents as $document) {

                $request->validate([
                    'documents' => 'required|file|max:1024',
                ]);

                $filename = "filename".time().'.'.request()->documents->getClientOriginalExtension();

                $request->documents->storeAs('public/documents',$filename);

                Document::create([
                    'subpage_id' => $subpage->id,
                    'filename' => $filename
                ]);
            }
        }
        return redirect()->action('SubpageController@slist');
    }

fragment of create.blade.php view:

 <input type="file" id="uploadDocument" onchange="ValidateFileSize(this)" name="documents[]" multiple aria-describedby="fileHelp"/>

and route:

Route::get('subpage/create','SubpageController@create')->middleware('auth');
Route::post('subpage/', 'SubpageController@store')->middleware('auth');

I'm not sure, but it's probably the controller function problem. I don't get any error, but the file is not saved in the database. I have empty records Could someone help me figure out where I am making a mistake? Thanks.