Hi peterwangbiz,

Thank you for your purchase.

1. All phrases are located in Dashboard > Forums > Settings > Addons > Attachments admin page  for quick translation to any language. 
2. wpForo Spam control checks a minimum number of posts a user must have to be able to attach a file, you can decrease this level to 0 in Dashboard > Forums > Tools > Antispam admin page:

For further support, please open a new support topic in the gVectors forum. Here we support the free core wpForo plugin.

Hi @peterwangbiz,

Please follow this support topic for further support:

https://gvectors.com/forum/wpforo-advanced-attachments/attach-files-button-doesnt-work/#post-7776

Here we only support the free core wpForo plugin. Addon support is only available on gVectors Team support forum.

1, "Dashboard > Forums > Settings > Addons > Attachments admin page" - I'm here now. Do you mean - I translate all the "Front-end Phrases" into Chinese by myself?

2, I've already set it into "0". the "    Attach Files  " is appeared there, but when you click it, it doesn't work (it stop working after I installed "wpForo Advanced Attachments")

Thanks.

1, "Dashboard > Forums > Settings > Addons > Attachments admin page" - I'm here now. Do you mean - I translate all the "Front-end Phrases" into Chinese by myself?

Yes. WordPress plugins have no all language translation this is always a part of users, it doesn't matter the plugin is free or paid.

2, I've already set it into "0". the "    Attach Files  " is appeared there, but when you click it, it doesn't work (it stop working after I installed "wpForo Advanced Attachments")

We're preparing new version of Advanced Attachment addon. It'll enable the default file uploading button for guests. The Advanced Attachment cannot be enabled for guests. because it's based on user specific media library. Guests are not users, they don't have account, thus they cannot have media library.

I'm closing this topic here. For further support please use gVectos Support forum.