Problem with upload image

[seb]

Hi all and happy new year
I have a problem with my nodebb install...
When i want to upload image on a post, i see the progress bar and have this message "Connection [MyForum] has been lost, attempting to reconnect"

My configuration :
NodeBB 0.9.3
Settings ok to upload images
Upload image on profil works
Redactor plugin 1.3.6

Without redactor, it's ok => problem with the redactor plugin? or maybe settings?

[seb]

I see on the log before the error message and crash forum "undefined undefined"... maybe an error with the path or other settings on the plugin

I try to modify the upload path on the plugin source (static/lib/redactor.core.js : /api/post/upload) and reload the forum
Like this, no error message but no upload of my image...

If you have an idea...

[seb]

mhhh it seems that it is not related to redactor
i try without and... in fact, no upload and i have the same error

however, little png files are ok (with and without redactor)
maybe a problem with the size or extension of my file (2,8Mo / jpg)

[seb]

okay, just a problem with the format : i convert my jpg on png and all is ok (with or without redactor)