Could be the card is not used in a camera, but in a tablet. Also could be the card is not SD, but SDHC or even SDXC, while the device is only compatible with SD.
If you look carefully, what usually occurs is that it is the internal memory that is getting full. It is very hard to fill an SD card unless you have a LOT of pictures and videos saved. Some apps are written to allow them to be moved to and run from the SD card, others allow their data to be stored there, but unfortunately, most still seem to insist that they run exclusively on internal memory. This prohibits the ability to free up internal memory and eventually results in your having to decide which apps are more important than others. Cleaning up the memory by deleting data caches helps, but until the phone manufacturers either increase internal memory or insist that apps writers take advantage of SD cards when available, this problem will continue to haunt us all.
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