HTC 526 Desire Space Issue

Over time, drive space has been diminished to the point where nothing can be added. The greater casualty is that some apps icons cannot be found and therefore cannot be launched. The sync app directs videos, images, etc. but no space is gained. Therefore the files are synched but no drive space is gained. Have searched the phone at every visible folder. Seeking guidance on how to find these files for deletion. Guidance sought

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