I am attaching two pictures.
我附加了两张图片。
I've attached two pictures. Please let me know if you can view them.
我附加了两张图片。请告知我你能否看到。
I'm attaching two JPG files.
我附加了两个JPG文件。

Let me know if you can open the files.
请告知我您能否打开该文件。
I am resending the files as you said you couldn't open them. Let me know if it works this time.
您说您无法打开我发过去的文件， 因此我从新给您发送了一遍。如果这次能打开，请告诉我。