Upload product images massively

Greetings, as you can upload pictures of products without having to make one by one? I have put in the folder images / stories / virtuemart / product / but will not let me choose it. I have to upload one by one from file upload. See if you can help me with this, because many products and 4 images per product. thanks

ok, I see the option "Sicronize media with virtuemart" that sincronize the path images/stories/virtuemart/product/ with virtuemart, but I have this error:

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Found prior migration process, resume migration maxScriptTime 39999 maxMemoryLimit 117
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Todos los archivos sincronizados 4
Info: File for images/stories/virtuemart/product/Jon Renau por categorias.doc is missing

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What mean, the second error is because I remove .doc, but the first error I don't know??
Help please

what first error?

First Error:
Found prior migration process, resume migration maxScriptTime 39999 maxMemoryLimit 117
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Archivos %s de media sincronizados en el directorio %s.
Todos los archivos sincronizados 4
Second Error:
Info: File for images/stories/virtuemart/product/Jon Renau por categorias.doc is missing
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Only 4 images sync, I add 30

Perhaps your server runs out of memory. Your server administrator must increase maxScriptTime and maxMemoryLimit parameters.

I tested with a single image and gives me the same error, do not think it memory problem .