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Hello vnn333 and welcome to XOOPS forums
I am not aware of a file size restriction for this module. However your server may have a file size limit that you may be exceeding, especially if you are posting graphics as well as text. Having said that, I found a text restriction limit on another module WFsections that was not related to the file size. I posted 80,000 words of plain text with no graphics, it weighed in at about 300kb but still cut off when uploaded. There maybe a global character limit for the XOOPS system, Im not certain. Perhaps other can comment?
Richard